he really knows his stuff 他真有两手
he knows his stuff
他精通自己的专业
以上为机器翻译结果，长、整句建议使用 人工翻译 。
He knows his stuff, and in common with the most effective Eurosceptics like the Conservative MEP Dan Hannan, he enjoys a good duel as an intellectual challenge.
ECONOMIST: European politics
He is just phenomenal, and he knows his stuff.
WHITEHOUSE: First Lady Speaks to Students at Blues Workshop
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