ac
ac — 縮寫
1. a common short form used in speech, messages, and product listings for an air co
冷氣；空調
空氣調節設備或系統的縮寫
a common short form used in speech, messages, and product listings for an air conditioner or for the system that cools indoor air
The hotel listing said AC was included in every room.
旅館簡介上寫著每個房間都附有冷氣。
AC in hotel listings for room facilities
Saira turned the AC down after the baby fell asleep.
寶寶睡著後，Saira 把冷氣調小了。
turn the AC down
Our bus had no AC, so everyone's shirts were wet by noon.
我們搭的巴士沒有冷氣，所以到中午大家的襯衫都濕了。
The repair crew tested the new AC before guests arrived.
維修人員在客人到達前測試了新的空調。
Beatriz asked whether the apartment's AC worked in August.
Beatriz 問這間公寓的冷氣到了八月是否還運轉正常。
- air conditioning
the full form; more explicit and slightly more formal than AC
- air conditioner
usually names the machine itself rather than the whole cooling system
- cooling
broader word that can describe the effect without naming the equipment
- heating
warms a space instead of cooling it
文法句型
have AC
turn the AC up/down
AC in + room/building/car
AC is on/off
用法筆記
Often refers either to the machine itself or to the cooling system for a room, car, or building. In everyday speech, people commonly say 'the AC is on' or 'the AC broke' instead of using the full term.
常見錯誤
2. a short form used in electrical talk for current that reverses direction again a
交流電
方向會反覆改變的電流
a short form used in electrical talk for current that reverses direction again and again as it moves through a circuit
The wall socket provides AC, not the direct current from batteries.
牆上的插座供應的是交流電，不是電池提供的直流電。
AC contrasted with battery-powered direct current
Ezra learned that AC changes direction many times each second.
Ezra 學到交流電每秒都會多次改變方向。
core property: current changes direction repeatedly
The engineer checked whether the motor could run on AC.
工程師檢查這台馬達是否能用交流電運轉。
This adapter turns household AC into lower-voltage power for the toy.
這個轉接器會把家用交流電轉成給玩具用的較低電壓電力。
During class, Baraka drew a wave to explain AC on the board.
上課時，Baraka 在黑板上畫了波形來解釋交流電。
- alternating current
the full form used when the abbreviation needs to be spelled out
- AC power
common technical phrase for electrical power delivered as alternating current
- direct current
electric current that flows in one direction only
文法句型
run on AC
AC power
convert AC to DC
household AC
用法筆記
Usually appears in technical, classroom, or product-label contexts and is often contrasted with DC. Distinguish from sense 1, which is about cooling equipment in homes, vehicles, and buildings.