名词
中文翻译：原因
同义词：
['cause', 'reason', 'rationale']
例句：
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1. The accident was caused by a malfunctioning brake.
事故是由于刹车失灵引起的。
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2. He decided to leave because of the bad weather.
他决定离开，因为天气不好。
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3. She gave up smoking because she wanted to improve her health.
她戒掉了吸烟，因为她想改善健康状况。