名词短语
中文翻译：原因
同义词：
['cause', 'purpose', 'rationale']
例句：
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1. I'm not sure why you left without saying goodbye.
我不明白你为什么没打招呼就离开了。
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2. The reason for his absence was due to a sudden illness.
他缺席的原因是突然生病了。
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3. She didn't give me the reason for her decision.
她没有告诉我她决定的原因。