N-COUNT An actor's or actress's understudy is the person who has learned their part in a play and can act the part if the actor or actress is ill. 替角
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。
He is understudying the famous film star.
他在为那位著名影星充当替角。
And I didn't even know that they were understudying it.
而且我以前甚至不知道他们当过预备演员。
But carbon fiber, which is used only sparingly now because of its cost and complexity, is understudying for a larger role.
由于碳纤维的高成本和复杂性，因此宝马对它的使用还比较谨慎，但它未来必然会在宝马汽车上扮演更大的角色。
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