溯因思维：“这事为什么发生（Why did this happen）？”是一种因果思考模式，即对发生的问题经过探索了解问题发生的原因，以便能采取适当的改善行动。
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why did this happen
为什么会发生这种情况？
以上为机器翻译结果，长、整句建议使用 人工翻译 。
He asks why did this happen?
他问，这样的事情为什么会发生呢？
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So why did this happen?
为什么会发生这种情况呢？
Why did this happen?
为什么会出现这种情况？
He asks why did this happen? Both of Kurdistan's ruling parties, the KDP and the PUK, ran jointly against several-dozen smaller parties.
VOA: standard.2009.07.26
Forrest... Why did this happen?
VOA: standard.other
Like us, they want to know, why did this happen?
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He's been posing questions about where AIDS came from, such as why did this all happen in the late 20th century?
NPR: Origin of AIDS Linked to Colonial Practices in Africa
Why did this decline happen?
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