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. 催淚瓦斯
Police used tear gas to disperse the demonstrators. 警察動用了催淚瓦斯來敺散示威人群。
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