名词
中文翻译：Unknown
同义词：
['substitute', 'substitute', 'fill-in', 'stand-in']
例句：
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1. 试镜者；临时演员2.
在戏剧、电影等中
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3.
在体育比赛中
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1. She was a walk-on in the play last night.
她昨晚在剧中是临时演员。
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2. The actor had to walk-on for the main role because the lead actor was injured.
由于主演受伤，这位演员不得不临时扮演主要角色。
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3. He stepped in as a walk-on when the main singer was ill.
当主要歌手生病时，他临时代替演唱。