It is relatively straightforward to design a product that does well by its users, but the effect that product has on others is sometimes more difficult to calculate.
设计一件让用户觉得好使的产品相对简单，产品对于别人的影响有时却难以计算。
There are various reasons for middle school students to cheat in the exam, but among them, the phycological reason is relatively more important and is difficult to be corrected.
中学生考试作弊的原因是多方面的，但心理原因占重要地位，而且纠正起来也较为困难。
There are various reasons for middle school students to cheat in the exam, but among them, the phycological reason is relatively more important and is difficult to be corrected.
中学生考试作弊的原因是多方面的，但心理原因占重要地位，而且纠正起来也较为困难。
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