ringleaders
n.
（违法犯罪团伙的）头目，首恶，元凶( ringleader的名词复数 );
例句:
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The team posed as drug dealers to trap the ringleaders.
该队队员装扮成毒品贩子，诱捕罪犯头目。
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The soldiers were well informed about the ringleaders of the protest.
士兵们对这次抗议活动的带头者已经了如指掌。
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The ringleaders were arrested and charged with mutiny.
为首的人遭到逮捕并以叛乱罪被起诉.
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Salahuddin and Nahidian were thought to be the ringleaders.
来自NEWYORKER
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Power vacuums lead to cliques and ringleaders and interpersonal conflict at work.
来自WSJ
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Of the three named ringleaders, Wat Tyler, John Ball and Jack Straw, little to nothing is known.
来自BBC