3. Please switch off when you leave your room. 离开房间的时候，请记得关上开关。
英英解释
n.
1. control consisting of a mechanical or electrical or electronic device for making or breaking or chan
2. an event in which one thing is substituted for another
3. hairpiece consisting of a tress of false hair; used by women to give shape to a coiffure
4. railroad track having two movable rails and necessary connections; used to turn a train from one tra
5. a flexible implement used as an instrument of punishment
6. a basketball maneuver; two defensive players shift assignments so that each guards the player usuall
7. the act of changing one thing or position for another v.
1. change over, change around, as to a new order or sequence
2. exchange or give (something) in exchange for
3. lay aside, abandon, or leave for another
4. make a shift in or exchange of
5. cause to go on or to be engaged or set in operation
6. flog with or as if with a flexible rod
7. reverse (a direction, attitude, or course of action)
