出门时请随手关灯。
Turn the light off as you go out.; Please switch off the lights when you leave.
离开教室时应随手关灯,关好窗户和锁好门。
Students shall turn off light and lock windows and doors before they leave classrooms.
我们可以节约用水,循环利用教科书,离开教室时随手关灯。
We can conserve water, recycle our textbooks, and turn off lights on leaving our classrooms.
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