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happy-go-lucky ------ 无忧无虑的（形容词，非正式）

英文释义

(adjective, INFORMAL) Describing a cheerful, carefree person who has a relaxed, unconcerned attitude about everything.

例句

While my aunt is a serious woman who seldom laughs, my uncle is a happy-go-lucky man who never worries about the future.

我的婶婶是个严肃的人，很少大笑，而我的叔叔是个乐天派，从不担心未来的事情。

来自：VOA英语网 文章地址: https://www.veryv.net/html/20181010/594493.html