名词
中文翻译：Unknown
同义词：
['major accident', 'serious accident']
例句：
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1. Theheavy accident has caused a lot of damageto the city.
重大事故已经给城市造成了很多损害。
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2. The driver was seriously injuredin the heavy accident.
司机在重大事故中严重受伤。
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3. The authorities are investigating thecause of the heavy accident.
当局正在调查重大事故的原因。