| 释义 |
nitrous oxide
UK [ˌnaɪ.trəs'ɒk.saɪd] US [-'ɑ:k-] noun uncountable specialized
■a type of gas with a sweet smell which is used as a weak anaesthetic (= substance which stops pain) , especially by dentists; laughing gas 一氧化二氮；笑气（一种带甜味的气体，有轻微的麻醉作用，常用于牙科止痛） |