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- 罗马帝国为何衰亡？
What made the Roman Empire decay?
- 你一定要急急忙忙走吗？为何不留下喝杯茶呢？
Must you dash off? Why not stay for a cup of tea?
- 我要发火了，你为何瞒我这么多事？
I shall lose my temper. Why do you hide so much from me?
- 我不知道他为何辞去他的职务。
I have no idea why he resigned his post.
- 那就是他为何哭的原因。
That's (the reason) why he cried.
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