Definition
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why
The word 'why' is used to ask for the reason or explanation behind something.
‘为什么’这个词用来询问某事背后的原因或解释。
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Why did you choose that restaurant for dinner?
你为什么选择那家餐厅吃晚饭?
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I don't understand why it rained today.
我不明白今天为什么会下雨。
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Can you tell me why you are upset?
你能告诉我你为什么不高兴吗?