i
/aɪ/ (bre, ipa) · [ˈaɪ] /aɪ/ (ame, ipa) · [ˈaɪ] /ˈī/ (ame, mw)
i — 名詞
- isingular
- isplural
1. The letter i is the ninth character in English writing. It is a vowel that can s
字母
英語字母表中的第九個字母
The letter i is the ninth character in English writing. It is a vowel that can stand for different sounds, as in the words 'win' and 'time'.
The word 'bicycle' is spelled with a lowercase i after the letter c.
「bicycle」這個字在 c 後面拼寫的是小寫的 i。
lowercase vs capital: letter i is lowercase in most words
Hari wrote a capital I at the beginning of the diary entry.
Hari 在日記的開頭寫了一個大寫的 I。
In class, the teacher asked the students to circle every letter i in the poem.
課堂上，老師要求學生圈出詩裡面所有的字母 i。
Camila is learning how to write the letter i in cursive handwriting.
Camila 正在學習如何用草書寫字母 i。
常見錯誤
2. Within the Roman system of writing numbers, the capital letter I is the symbol f
羅馬數字一
羅馬數字系統中用來表示1的符號
Within the Roman system of writing numbers, the capital letter I is the symbol for one. It appears alongside V, X, and other letters to build numbers from two up to nine.
The Roman numeral I means the number one on the face of this old clock.
在這座老時鐘的鐘面上，羅馬數字 I 代表數字 1。
Roman numeral I = 1, used on clock faces
David read Chapter I of the book before going to sleep.
David 在睡覺前讀了書的第一章（Chapter I）。
World War I ended in 1918 after more than four years of fighting.
第一次世界大戰（World War I）在歷經四年多的戰事後，於 1918 年結束。
On the statue, the year was carved in Roman numerals ending with I for one.
雕像上的年份以羅馬數字雕刻，最後的 I 代表 1。
Super Bowl I was played between the Green Bay Packers and the Kansas City Chiefs.
第一屆超級盃（Super Bowl I）是由綠灣包裝工隊對上堪薩斯城酋長隊。
用法筆記
Roman numerals are usually written in capital letters. The lowercase i is not standard for representing numbers in English.
常見錯誤
i — 縮寫
1. used in maps and official documents to show that an area is meant for factories,
工業
工業區分類代號
used in maps and official documents to show that an area is meant for factories, warehouses, or other types of industry — for example, I-1 for light industrial or I-2 for heavy industrial.
Nia checked the city map and saw that her street was in an I-1 zone.
Nia 查看都市地圖，發現她住的街道屬於 I-1 工業區。
The planning board voted to change the area from I-2 to residential use.
都市計畫委員會投票決定將該區從 I-2 改為住宅用地。
i + number for industrial zone classification
Only factories and storage buildings can be built on land marked I.
標示為 I 的土地只能建造工廠和倉庫。
Brandon bought a warehouse in an I district because the rent was lower.
Brandon 在 I 工業區買了一間倉庫，因為租金比較便宜。
文法句型
i + number
用法筆記
Typically appears as part of a code (I-1, I-2) on zoning maps. Not used in everyday speech.
2. short for the first letter of a person's first name, used when writing someone's
首字母
名字的第一個字母
short for the first letter of a person's first name, used when writing someone's name in a formal or shorter style — for example, I. Asimov or J. K. Rowling.
The letter was signed by I. K. Peterson, a lawyer from Chicago.
這封信的署名是 I. K. Peterson，一位來自芝加哥的律師。
I. + surname for first initial
Please write your name as last name followed by your first initial.
請以姓氏加上名字首字母的方式填寫姓名。
Kabir wrote "B. Zayd" on the form because the space was too small.
Kabir 在表格上寫了「B. Zayd」，因為格子太小了。
On the old novel's cover, the name 'I. Asimov' appeared in gold above the title.
那本舊小說的封面上，「I. Asimov」這個名字以金色字體出現在書名上方。
- initial
the full word, not an abbreviation
文法句型
I. + surname
用法筆記
Always capitalised when used as a name initial. The letter is followed by a period (full stop) in American English.
常見錯誤
3. short for intelligence, most often used as part of the abbreviation I.Q. (intell
智力
智商測驗中的智力
short for intelligence, most often used as part of the abbreviation I.Q. (intelligence quotient) to describe a person's measured mental ability compared to others of the same age.
Hugo scored very high on the I.Q. test given by the school psychologist.
Hugo 在學校心理師施測的智力測驗中獲得非常高的分數。
The study compared I.Q. scores of children who learned music early.
該研究比較了早期學習音樂的兒童的 IQ 分數。
Amira read that a person's I.Q. can change slightly over many years.
Amira 讀到一個人的 IQ 在多年間可能會有微幅變化。
Scientists no longer believe that I.Q. alone decides success in life.
科學家已經不再認為 IQ 是決定人生成功的唯一因素。
文法句型
I.Q.
用法筆記
Nearly always appears as I.Q. rather than as a standalone 'I' for intelligence. The abbreviation is always capitalised.
4. a symbol used in science and engineering to represent the strength or magnitude
強度
科學中表示強度的通用符號
a symbol used in science and engineering to represent the strength or magnitude of something that is being measured — for example, the intensity of light, sound, or a magnetic field. It is not limited to any one specific physical quantity.
The light meter showed an I value of 800 lumens for the brightness in the room.
測光錶顯示房間亮度的 I 值為 800 流明。
I as symbol for light intensity measurement
Seoul's noise monitoring station recorded an I level of 82 decibels during the evening rush hour.
首爾的噪音監測站在傍晚尖峰時段測得 I 值為 82 分貝。
I as sound intensity level
When the machine's I reading drops below 20, the technician checks the signal source.
當機器的 I 讀數降到 20 以下時，技術人員就會檢查訊號源。
The textbook said I stands for the general intensity of a wave in the experiment.
課本說 I 在實驗中代表波的強度。
文法句型
I = value in formulas
用法筆記
The symbol I for intensity is usually written in italics in scientific texts. Do not confuse this general intensity symbol with the letter I used specifically for electric current in circuits.
5. short for interlaced, used in video display standards to show that a screen refr
交錯
交錯掃描的影像格式
short for interlaced, used in video display standards to show that a screen refreshes by drawing every other line in each pass rather than every line at once — for example, 1080i or 480i.
The old television broadcast in 1080i, not the newer 1080p format.
那台舊電視以 1080i 格式播放，而非較新的 1080p。
number + i for interlaced video format
Diya noticed that 480i video looked less smooth than 720p video.
Diya 注意到 480i 的影片看起來不如 720p 流暢。
Most cable channels still send a 1080i signal to customers at home.
大部分有線電視頻道仍以 1080i 訊號傳送到用戶家中。
A 1080i screen draws 540 lines at a time, but the eye blends them.
1080i 螢幕每次只畫 540 條線，但人眼會自動將其融合。
- p
progressive scan — draws every line on every pass
文法句型
number + i
用法筆記
Always follows a number (e.g. 1080i, 480i) indicating the vertical resolution. Contrasts with 'p' (progressive scan).
6. short for intransitive, used in dictionaries and grammar books to mark a verb th
不及物
文法中的不及物動詞縮寫
short for intransitive, used in dictionaries and grammar books to mark a verb that does not take a direct object — for example, 'sleep (v.i.)' or 'arrive (vi)'.
The dictionary marks "arrive" as v.i. because you cannot arrive something.
字典將「arrive」標示為 v.i.，因為你不能 arrive 某個東西。
v.i. marking intransitive verb
Bao looked up "happen" and saw the label i, meaning no object is needed.
Bao 查詢「happen」時看到 i 的標記，表示不需要受詞。
Some verbs like "eat" can be v.t. or v.i. depending on the sentence.
像「eat」這類動詞可以視句子情況標為 v.t. 或 v.i.。
Minh checked the grammar table: v.i. stands for intransitive verb.
Minh 查看文法表：v.i. 代表不及物動詞。
- intransitive
the full word, not abbreviated
- v.t.
transitive verb — takes a direct object
文法句型
verb marked i
用法筆記
Often written as v.i. or vi in dictionary entries. Paired with v.t. (transitive verb) as the opposite label.
常見錯誤
7. a written abbreviation for island or isle, used in place names and on maps to sh
島；嶼
島嶼的英文縮寫
a written abbreviation for island or isle, used in place names and on maps to show a piece of land completely surrounded by water
The ferry to I. of Wight leaves the port every two hours.
前往懷特島的渡輪每兩小時從港口出發。
abbreviation in place names: I. of [Name]
Amira booked a hotel on I. of Man for her summer holiday.
Amira 在馬恩島訂了一家飯店度暑假。
On the map the words 'I. Skye' appeared in small print near the coast.
地圖上「I. Skye」以小字體出現在海岸附近。
The sailors watched the cliffs of I. de Ré appear on the horizon.
水手們看著雷島的懸崖出現在地平線上。
用法筆記
Often written with a period in British English. Always part of a proper place name, never used alone to mean 'island' in general prose.
常見錯誤
8. the symbol for electric current, used in physics and electronics to show the flo
電流
物理中電流的符號
the symbol for electric current, used in physics and electronics to show the flow of electric charge through a conductor, measured in amperes
In the equation V equals I times R, the I stands for electric current.
在公式 V 等於 I 乘以 R 中，I 代表電流。
I in the formula V = IR (Ohm's law)
Renata measured I at two amperes when she closed the switch.
Renata 關上開關時測得電流 I 為 2 安培。
I measured in amperes (A)
A higher I value means more charge flows through the wire each second.
I 值越高，表示每秒通過導線的電荷越多。
The circuit diagram had 'I equals 0.5 A' written next to the resistor.
電路圖上電阻旁邊標示著「I 等於 0.5 A」。
用法筆記
Always written without a period in scientific and mathematical contexts. Used in formulas alongside units such as A (amperes) or mA (milliamperes).
9. a written abbreviation for Indian, used before the names of organizations, gover
印度
印度人或物的英文縮寫
a written abbreviation for Indian, used before the names of organizations, government bodies, and institutions to show they belong to or come from India
The I. Space Research Organisation launched a satellite to study the moon.
印度太空研究組織發射了一顆衛星來研究月球。
I. stands for Indian before organization names
Owen read about the I. Navy's rescue mission in the newspaper.
Owen 在報紙上讀到印度海軍的救援任務。
The I. Railways network is one of the largest in the world.
印度鐵路網是世界上最大的鐵路運輸系統之一。
Zayd's mother booked a ticket on I. Airlines for her trip to Chennai.
Zayd 的母親訂了印度航空的機票前往清奈。
用法筆記
Most often seen in news headlines, official names of Indian institutions, and on airline or railway branding. Do not confuse this abbreviation with the pronoun 'I'.
常見錯誤
10. a written abbreviation for interstate, used in US road names before a number to
州際公路
美國州際公路的縮寫
a written abbreviation for interstate, used in US road names before a number to show a major highway that connects different states
Take I. 95 north if you want to drive from New York to Boston.
要從紐約開車到波士頓，請北上走 95 號州際公路。
I. + highway number for US interstate routes
Kevin said the traffic on I. 5 was terrible during the holiday weekend.
Kevin 說假日期間 5 號州際公路的交通非常糟糕。
A truck broke down on I. 40 near the Arizona border this morning.
今天早上亞利桑那州邊界附近的 40 號州際公路上一輛卡車故障了。
The map showed I. 10 running all the way from California to Florida.
地圖顯示 10 號州際公路從加州一路延伸到佛羅里達州。
用法筆記
Always followed by a number. Only used in American English contexts. In speech, 'I-95' is read as 'eye ninety-five'.
常見錯誤
11. a written abbreviation for Israeli, used before the names of organizations, gove
以色列
以色列人或物的英文縮寫
a written abbreviation for Israeli, used before the names of organizations, government bodies, and official institutions related to the country of Israel
The I. embassy in Paris released a statement about the festival.
以色列駐巴黎大使館就文化節發表了一份聲明。
I. stands for Israeli before official organizations
Andrei met with the I. ambassador to discuss trade agreements.
Andrei 與以色列大使會面討論貿易協定。
The I. shekel has gained value against the dollar this year.
今年以色列謝克爾對美元升值了。
Hiro read about the I. military's new training programme online.
Hiro 在網路上讀到關於以色列軍隊新訓練計畫的消息。
用法筆記
Most often seen in news headlines, diplomatic contexts, and official names of Israeli institutions. In formal writing, the full word 'Israeli' is usually preferred.
i — 代名詞
1. You use this word when talking about yourself, before a verb, to show that you a
我
說話者或寫作者自稱
You use this word when talking about yourself, before a verb, to show that you are the person who does something or who feels a certain way.
I am a teacher at the local primary school near the river.
我在當地的小學擔任老師。
I + be + [role]: introducing yourself
I always take the bus to work because I do not own a car.
我總是搭公車上班，因為我沒有車。
I + verb + reason clause: daily routine
Before class I prefer tea over coffee in the morning.
上課前，我比較喜歡喝茶而不是咖啡。
Last summer I visited my cousin Quan in Tokyo for ten days.
去年夏天，我去東京拜訪表弟 Quan，待了十天。
I hope to learn how to play the guitar later this year.
我希望今年晚些時候能學會彈吉他。
- you
second person singular pronoun — refers to the person being spoken to
文法句型
I + verb (always the subject)
用法筆記
Always written as a capital letter 'I' in English, even when it appears in the middle of a sentence. This is the only English pronoun that is capitalised regardless of position.
常見錯誤
i — 符號
1. In mathematics, the symbol that represents the square root of negative one, writ
虛數單位
√-1的數學符號
In mathematics, the symbol that represents the square root of negative one, written as i, which makes it possible to express numbers that combine a real part and an imaginary part.
In algebra class, Ms. Chen's students learned that i squared equals negative one.
在代數課上，陳老師的學生學到 i 的平方等於負一。
core identity: i² = −1
A number written as 3 + 2i is called a complex number in mathematics.
一個寫成 3 + 2i 的數字在數學中稱為複數。
usage pattern: a + bi form of complex numbers
Without the number i, the equation x² = −1 would have no possible solution.
如果沒有虛數單位 i，方程式 x² = −1 就不可能有解。
Electrical engineers use the letter j instead of i to represent √−1.
電機工程師用字母 j 而不是 i 來表示 √−1。
The value of i appears when solving quadratic equations that have no real roots.
在解沒有實數根的二次方程式時，就會出現 i 這個值。
用法筆記
In mathematics, i is always written in lowercase italic. In electrical engineering, j is used instead of i to avoid confusion with electric current (symbol I).
常見錯誤
2. The chemical symbol for iodine, a dark purple non-metallic element that is used
碘
化學元素碘的代號
The chemical symbol for iodine, a dark purple non-metallic element that is used in antiseptics and is essential for the human body to function properly.
The periodic table shows I as the symbol for the element iodine.
元素週期表上以 I 表示碘元素。
chemistry context: I on the periodic table
A lack of iodine, marked by the symbol I, can harm the thyroid gland.
缺乏以符號 I 表示的碘，會傷害甲狀腺。
In the chemistry lab, Amira wrote the formula I₂ to represent iodine gas.
在化學實驗室裡，Amira 寫下 I₂ 這個化學式來表示碘氣。
The symbol I appears on bottles of antiseptic that contain iodine.
含有碘的消毒藥水瓶上會出現符號 I。
Table salt often has added iodine, known by its chemical symbol I.
食鹽中通常添加了碘，以其化學符號 I 為人所知。
用法筆記
I is always capitalised when used as a chemical symbol. The element iodine is essential for the production of thyroid hormones.