The reason I succeeded was because I was lucky . | 我之所以成功，是因为我很幸运。 | The reason which he gave is hard to understand . | 他给出的理由令人难以理解。
The reason she killed herself is unknown . 她自杀的原因尚不清楚。
The reason for your failure is that you did not try hard enough . 你失败的原因是你不够努力。
What is the reason for that lie ? 这个谎言的理由是什么？
What is the purpose of your visit ? 您此行的目的是什么 ？
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