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We all know that cheating on our taxes is a no-no.

我们都知道偷税漏税是绝对不行的。

《柯林斯英汉双解大词典》

I'd found Philippe was cheating on me and I was angry and hurt.

我发现菲利普对我不忠，我很愤怒并且受到了伤害。

《柯林斯英汉双解大词典》

In schools, the punishment for cheating could be a failing grade on the paper or in the course.

VOA: special.2009.04.16

You hear from other people that she's cheating on him.

你从其他人口中得知这女孩背地里对他不忠。

The thing is 课堂 - SpeakingMax英语口语达人

On the other hand, in 1984, Gary Hart was accused of cheating on his wife.

FORBES: Commentary

But people cheating on their spouses are not the only ones to frequent telos.

BBC: Argentina's discreet way with sex

Over 120 students were implicated for cheating on an exam in an introductory government class last spring.

BBC: Harvard University file picture