Thirdly, pollution is also a worrying problem—water in rivers and wells becomes undrinkable because of industrial wastes.
另外，因为工业污染，有些水已经不适宜饮用了。
The problem of middle school students' cheating in the exam has been a worrying problem in the practice of middle school management, so we should pay more attention to this problem.
中学生考试作弊问题已成为当前中学教育和管理实践中一个十分令人担忧的问题，必须引起我们的高度重视。
The problem of middle school students' cheating in the exam has been a worrying problem in the practice of middle school management, so we should pay more attention to this problem.
中学生考试作弊问题已成为当前中学教育和管理实践中一个十分令人担忧的问题，必须引起我们的高度重视。
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