be no slouch

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释义
(对作某事)很在行的，能胜任的，熟练的(后加at doing)
To be very hardworking, enthusiastic, and/or skillful.

例句
Leonard: Raj is from India, which means he's no slouch at holding his breath. (The Big Bang Theory)
莱昂纳德：拉什是印度人，意味着他憋气很在行的。（生活大爆炸）