他的23位学生上课的教室现在有了电灯、吊式电扇和安全的屋顶。
His classroom with 23 children now has lights, ceiling fans and a secure roof.
中午、下午和晚自习结束后最后一个离开教室的必须关掉电灯和电扇，并关好门窗。
After morning periods, afternoon periods or evening self-study periods, the students who leave last must turn off the lights and electric fans, and make sure all the doors and windows are closed.
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