... pull one’s weight 努力，尽力 know ones stuff 有经验；不用你废话 be second to none 全面专业的 ...
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know ones stuff
熟悉自己的东西
以上为机器翻译结果，长、整句建议使用 人工翻译 。
"Chefs and sommeliers are our people, because they are the ones with trained noses, and they're the ones that know their stuff, " she says.
WSJ: Stuck With 30,000 Boxes of Gourmet Chocolate
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