英语语法分析

He was an understudy to Charlie Chaplin on a tour of the U.S.

他曾是查理•卓别林美国巡演的替角。

《柯林斯英汉双解大词典》

A momentary hush; the orchestra leader varies his rhythm obligingly for her, and there is a burst of chatter as the erroneous news goes around that she is Gilda Gray's understudy from the Follies.

短暂的安静；乐队指挥亲切地为她变换节奏，当她是吉尔达·格雷在《愚蠢》里的替补演员的错误消息传开时，大家议论纷纷。

While the star is recuperating from her illness, her role will be played by her understudy.

当明星正在休养恢复健康时，她的角色由候补演员代替。