0 a gas used by some police and armed forces to control crowds of people. It hurts the eyes and makes them produce tears. -- 催淚氣體，催淚性毒氣
1 to use tear gas on someone (= a gas that hurts the eyes and makes them produce tears, used in order to control crowds of people) -- 催淚瓦斯，催淚性毒氣
Security forces clubbed and tear-gassed protesters. 安全部隊用棍棒和催淚瓦斯來對付抗議者。
It's hard for people who weren't there then to understand what it was like to be tear-gassed. 對於當時不在場的人來說，很難理解被催淚瓦斯襲擊的感覺。
