n. opportunist
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和大多数成功的政客一样，辛克莱也是个机会主义者。
Like most successful politicians, Sinclair was an opportunist.
《柯林斯英汉双解大词典》
与机会主义者对立的是竞争者。
The opposite of an opportunist is a competitor.
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大多数偷车贼是机会主义者、不熟练的小罪犯；许多人不到20岁。
Most car thieves are opportunist unskilled petty criminals; many are under 20.
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