tear gas
noun/ˈtɪə ɡæs/
/ˈtɪr ɡæs/
[uncountable]- a gas that makes your eyes sting (= hurt) and fill with tears, used by the police or army to control crowds
催泪瓦斯；催泪性毒气 - The police fired tear gas at the protesters.
警方向抗议者发射了催泪瓦斯。
- The police fired tear gas at the protesters.