do preparation before class
... 保持教室清洁 keep the classroom clean 课前要有准备 do preparation before class 坚持讲英语 insist on speaking English ...
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do preparation before class
课前做好准备
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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Do the preparation before, and exercises well after class, do homework without carelessness. To make good progress, is the biggest reward to the teacher.
做好课前准备，做好课后练习，认真完成家庭作业，不敷衍了事。取得良好的成绩，就是对老师最大的报答。
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