laughing gas      
noun [ U ]  informal uk/ˈlɑː.fɪŋ ˌɡæs/ us/ˈlæf.ɪŋ ˌɡæs/
 笑氣,一氧化二氮(一种用作麻醉剂的气体)
 nitrous oxide specialized : a type of gas that is used as an anaesthetic (= a substance that stops pain)
 
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