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兄弟会，同志会，同业工会（成员具有共同的政见、信仰或相同的职业）
A brotherhood is an organization whose members all have the same political aims and beliefs or the same job or profession.
例句
...the Brotherhood of Locomotive Engineers.
机车工程师同业行会
...a secret international brotherhood.
秘密的国际兄弟会