She became a professional mezzo-soprano.
她成为一名专业的女中音歌手。
He won't cut it as a professional singer.
他的歌艺未达到专业歌手水平。
He had been a professional since March 1985.
他自1985年3月以来一直是一名职业人士。
The first shooting incident by a person who could be considered a professional gunman took place in Texas in eighteen fifty-four.
VOA: special.2010.03.10
On other, on other grounds You, a professional economist, do not bring your expertise to bear on this man in evaluating him?
那是站在其他的角度,你可是一名专业的经济学家呢,难道你不,利用自己专业的评价来给他加点分吗?
I don't really have like a professional opinion or a very well-informed opinion.
我的观点并不专业,也不是很成熟。
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