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n. 预备演员, 替角
vt. 通过观察掌握某工作, 通过实习掌握某工作
vt.vi. 练习当替角

n. an actor able to replace a regular performer when required
v. be an understudy or alternate for a role

复数: understudies 现在分词: understudying 过去式: understudied 第三人称单数: understudies 过去分词: understudied