be a candidate (for a vacancy);be an alternate ;

Nevertheless, Margaret failed to get in, and her name was put on the waiting list.
尽管如此, 玛格丽特仍然未被录取, 但被列入了候补名单.
来源:词典精选例句When the star became sick, his understudy stepped into his part.
当这位电影明星生病时, 由他的候补演员担任他的角色.
来源:网络文摘精选In most jurisdictions, twelve jurors and two alternates are chosen.
大多数辖区都会选出12名陪审员和2名候补陪审员。
来源:《柯林斯高阶英汉双解学习词典》Two divers work together while a standby diver remains on the surface.
两名潜水员协同工作,同时有一名候补潜水员留在水面上.
来源:《简明英汉词典》
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