My biology teacher, Mr. White, came to the classroom five minutes before the class began.
我的生物老师怀特先生在上课前五分钟来到了教室。
It is the teacher and parents' responsibility to replace the chairs and desks as they were found before class began.
上完课后，老师和家长应该负责把桌子椅子摆回原样。
It is the teacher and parents' responsibility to replace the chairs and desks as they were found before class began.
上完课后，老师和家长应该负责把桌子椅子摆回原样。
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