Perhaps, similar to sails, they make a useful backup for when the lights go out.
也许，和风帆一样，它们作为备用品可以在熄灯的时候排上用场。
Remember to turn out the lights when you go to bed.
临睡前别忘了关灯。
Turn off the lights when you go out.
外出的时候把灯关上。
In order not to waste electricity, turn off all the lights when you go out.
为了不浪费电，出门时把所有的灯关掉。
Don't leave the lights on when you go out of the lab.
你离开实验室时不要让电灯开着。
Don't leave the lights on when you go out of the lab.
你离开实验室时不要让电灯开着。
应用推荐