There's a perfectly good reason why I let them do all those things to me.

我一定有很充分的理由,让他们这样来折磨我。

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I mean, that's a lot of reasons why you want to live here, right?

我是说，你有充分的理由住在这儿，对么？

That's why 课堂 - SpeakingMax英语口语达人

There may be bad reasons but there's no wrong answers.

有不充分的理由,但没有错误的理由

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then you have every right to spend the money on it.

然后你就有充分的理由把钱花在它上面了。

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