turn on / turn off 開 / 關
Could you please turn on the air conditioner?(可以麻煩你開冷氣嗎?)
Please remember to turn off your phone before you get on the airplane.(登機前請記得關掉手機。)
switch on / switch off 開 / 關
Don’t forget to switch on the fax machine and copier when you arrive at the office.(你到辦公室的時候,別忘了打開傳真機和影印機。)
Switch the TV off. You have to do your homework.(把電視關掉,你該做功課了。)
power up / power off 啟動 / 關掉
這通常是用在機器方面,如:電腦的開關,電燈開關就不會這樣用喔。
After we power up the computer, we can start.(啟動電腦後就可以開始了。)
shut off / shut down 關閉
通常會用在關閉引擎、機器或是電腦上,例如:
He finished the last process and shut down / shut off the engine.(他完成最後一步,然後關掉引擎。)
shut down 也很常用來說公司的停業,例如:
The company suddenly shut down because of bankruptcy.(這家公司因為破產就突然停業了。)