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Từ điển Oxford Advanced Learner 8th
nitrous oxide
ni·trous oxide [nitrous oxide] BrE [ˌnaɪtrəs ˈɒksaɪd] NAmE [ˌnaɪtrəs ˈɑːksaɪd] (also informal ˈlaughing gas) noun uncountable
a gas used especially in the past by dentists to prevent you from feeling pain
See also: ↑laughing gas
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