serve as an alternate
collocation担任候补；担任替补
She served as an alternate for the committee chair.
她担任委员会主席的候补。
候补者；替补者
先理解核心含义，再看它在真实句子里的用法。
候补者；替补者
a person who takes the place of another person
She served as an alternate on the committee when the chairperson was absent.
当主席缺席时，她担任委员会的候补委员。
交替出现的事物；更迭
That which alternates with something else; vicissitude.
替代他人的人
someone who takes the place of another person
更比例(由另一比例交换内项而得)
A proportion derived from another proportion by interchanging the means.
The team has three alternates ready to step in if any player gets injured.
球队有三名候补队员，随时准备在有任何球员受伤时上场替换。
I was the alternate for the lead role in the school play.
我是学校话剧主角的替补演员。
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担任候补；担任替补
She served as an alternate for the committee chair.
她担任委员会主席的候补。
指定替补
He was the designated alternate for the delegate.
他是代表的指定替补。
第一替补
If the winner cannot attend, the first alternate takes the prize.
如果获胜者无法出席，由第一替补领奖。
候补陪审员
The alternate juror listened carefully during the trial.
候补陪审员在审判期间认真倾听。
正式替补
The official alternate has all the same credentials as the primary member.
正式替补与正式成员具有相同的资格。
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联想：alternate 像“alter（换）+ nate”，想象替补球员 Nate 轮换上场；作名词指“替补/交替出现的事物”。
语域：formal 常见场景：正式会议或代表大会、行政任命或候补职务、比赛或活动的替补安排 作名词时，alternate 多用于正式场合，表示替补者或候补者，如会议代表、陪审员或岗位人员的备选；口语中更常说 substitute 或 backup。
六个词都以 -ate 结尾；在名词/形容词用法中，结尾都读作非重读的 /ət/，与 alternate 名词的结尾相同。但它们都不是完整押韵，因为重读元音不同（如 separate /ˈsɛpərət/ 的重音在首音节 /ɛ/）。注意：这些词中很多作动词时 -ate 读 /eɪt/（如 separate /ˈsɛpəreɪt/），拼写相同而读音不同。
Dictionary facts from DICTIONARY_API_DEV, ECDICT, WIKTIONARY, WORDNET.