tear gas
柯林斯词典
1. N-UNCOUNT Tear gas is a gas that causes your eyes to sting and fill with tears so that you cannot see. It is sometimes used by the police or army to control crowds. 催泪瓦斯
Police used tear gas to disperse the demonstrators. 警察动用了催泪瓦斯来驱散示威人群。
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