understudies
n.
预备演员，替角，代替之人( understudy的名词复数 );
例句:
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His understudies practise on weddings and jubilees.
来自THETIMES
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She also runs afternoon and evening rehearsals, and teaches understudies and new performers where to move onstage and when.
来自VOA
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His two understudies two of Ms Corelli's cats - slept on the sideboard and on the floor respectively.
来自THETIMES