arc
/ɑːk/ (bre, ipa) · [ˈɑrk] /ɑːrk/ (ame, ipa) · [ˈɑrk] /ˈärk/ (ame, mw)
arc — 名詞
- arcsingular
- arcsplural
1. A smooth, bending line — like the shape a rainbow makes in the sky, or the path
弧形
平滑彎曲的線條，如彩虹或拋物線
A smooth, bending line — like the shape a rainbow makes in the sky, or the path a ball follows when you throw it high.
The rainbow painted a perfect arc across the sky after the storm.
暴風雨過後，彩虹在天空中畫出一道完美的弧形。
collocation: perfect arc
Adisa drew a neat arc on the whiteboard to show the bending path.
Adisa 在白板上畫了一條整齊的弧形來展示彎曲的路徑。
Eli watched the golf ball follow a wide arc before it dropped.
Eli 看著高爾夫球沿著一道寬闊的弧形飛行，然後落下。
The bridge rose in a graceful arc above the dark river below.
橋樑以優美的弧形升起，跨越下方漆黑的河面。
Nadia cut the paper along a smooth arc to finish the craft project.
Nadia 沿著平滑的弧形剪開紙張，完成手工藝作品。
常見錯誤
2. A bright, continuous stream of electricity that jumps through the air between tw
電弧
電流在兩點之間跳過空氣產生的持續亮光
A bright, continuous stream of electricity that jumps through the air between two points that are not touching.
A bright blue arc jumped between the two wires when Yan flipped the switch.
Yan 按下開關時，一道亮藍色的電弧在兩條電線之間跳動。
The welder's torch produced a fierce arc as it joined the metal plates.
焊槍在接合金屬板時產生了強烈的電弧。
Rodrigo saw an electric arc flash across the gap in the damaged cable.
Rodrigo 看見一道電弧閃過損壞電纜的間隙。
The loud crack of an arc echoed through the power station during the test.
測試期間，電弧的響亮爆裂聲在發電站內迴盪。
Workers must wear dark goggles to protect their eyes from the welding arc.
工人必須戴上深色護目鏡來保護眼睛免受焊接電弧的傷害。
用法筆記
Common in technical contexts such as welding and electrical engineering. Not used for the small, brief sparks of static electricity — those are simply called 'sparks.'
3. The full journey of a character or the complete development of a theme across a
故事弧
角色或主題在故事中的完整發展歷程
The full journey of a character or the complete development of a theme across a story, film, or TV series — showing how someone or something changes from beginning to end.
The villain's redemption arc made him the most memorable part of the film.
反派的救贖故事弧使他成為電影中最令人難忘的部分。
collocation: redemption arc
Romi felt moved by the main character's emotional arc across the three novels.
Romi 被主角在三本小說中的情感故事弧所感動。
collocation: emotional arc
Each season of the show follows the personal arc of a different family member.
這部劇的每一季都跟隨不同家庭成員的個人故事弧。
Matthew wrote a powerful arc for the young hero who learns to trust others.
Matthew 為學會信任他人的年輕英雄寫了一段有力的故事弧。
The documentary traces the arc of the singer's career from garage band to stadiums.
這部紀錄片追溯了歌手從車庫樂團到大型體育場的職業軌跡。
- storyline
broader — the entire sequence of events in a plot, not just one character's progression
- trajectory
more formal; often used for careers or historical developments rather than fictional characters
- journey
more general; can describe any progression, real or fictional
用法筆記
Used mainly when discussing films, books, and TV series. Not generally used for describing real-life events or people's actual lives — it is a storytelling term.
常見錯誤
arc — 動詞
- arcpresent simple I / you / we / they
- arcs3rd person singular
- arcing-ing form
- arcedpast simple
1. To travel through the air or along a path following a smooth, bending line.
劃出弧線
沿著彎曲的路徑在空中移動
To travel through the air or along a path following a smooth, bending line.
The basketball arced high above the court before dropping cleanly through the net.
籃球高高地劃出弧線越過球場，然後乾淨地穿過籃網落下。
intransitive: arced + high above
Emre saw the arrow arc over the field and hit the centre of the target.
Emre 看著箭劃出弧線飛越田野，擊中靶心。
A flock of birds arced across the evening sky in a single smooth sweep.
一群鳥劃出弧線飛過傍晚的天空，動作流暢一致。
Diya threw the stone and it arced out over the lake before splashing down.
Diya 扔出石頭，石頭劃出弧線飛越湖面，然後濺落水中。
The fountain's water arced gracefully into the pool, sparkling in the sun.
噴泉的水優雅地劃出弧線落入池中，在陽光下閃閃發光。
文法句型
arc + adverb or preposition phrase
用法筆記
Often used with a direction phrase (overhead, across, toward, into). The past tense and past participle are 'arced.' Do not confuse with the noun — the verb describes the motion itself, not the shape.
2. To produce a bright electric spark that jumps across a gap between two conductor
起電弧
產生跳過間隙的電火花
To produce a bright electric spark that jumps across a gap between two conductors.
The damaged cable arced loudly, sending bright white sparks across the floor.
損壞的電纜起了電弧，發出響亮的聲音，白色火花四散落地。
When Nikos touched the two loose wires together, they arced with a sharp crack.
Nikos 碰到兩條鬆脫的電線時，它們起了電弧，發出尖銳的爆裂聲。
The old circuit breaker arced and filled the room with a burning smell.
老舊的斷路器起了電弧，房間裡充滿了燒焦的氣味。
Switch off the power before fixing the light, or the wires might arc.
修理電燈前要先關掉電源，否則電線可能會起電弧。
Jin noticed the loose connection was arcing whenever the machine started up.
Jin 注意到每次機器啟動時，鬆動的接頭就會起電弧。
- spark
verb — describes a brief, smaller discharge; 'arc' implies a sustained, visible stream of electricity
文法句型
arc + adverb or preposition phrase
用法筆記
A technical term used in electrical engineering. In everyday speech, people are more likely to say 'sparked' or 'short-circuited.' The past tense is 'arced.'
arc — 形容詞
- arcpositive
- arcercomparative
- arcestsuperlative
1. Used in mathematics to describe inverse functions — for example, arc sine, arc c
反三角
與反三角函數相關的
Used in mathematics to describe inverse functions — for example, arc sine, arc cosine, and arc tangent, which reverse the usual sine, cosine, and tangent operations to find the angle.
Madison used the arc sine function to find the missing angle in the triangle.
Madison 使用反正弦函數來找出三角形中缺少的角度。
Ms. Okonkwo opened the textbook and explained arc sine as the function that reverses sine.
Ms. Okonkwo 翻開教科書，將反正弦解釋為逆轉正弦運算的函數。
Dmitri used arc cosine at the workbench to find the angle of the leaning steel strut.
Dmitri 在工作檯前使用反餘弦來計算傾斜鋼支柱的角度。
The arc sine button on the calculator is often marked as sin⁻¹.
計算機上的反正弦按鈕通常標記為 sin⁻¹。
Yan pressed the arc tangent key and wrote down the result in her notebook.
Yan 按下反正切鍵，將結果寫在筆記本上。
- inverse
broader mathematical term — 'arc sine' and 'inverse sine' mean the same thing, but 'arc' is the traditional notation in function names
用法筆記
This is a highly technical term used only in advanced mathematics. It always appears directly before 'sine,' 'cosine,' or 'tangent' — never as a standalone adjective.