a fill-in for sb/sth
可数名词，常用 a fill-in for 说明替补的对象。
She is a fill-in for the regular presenter this week.
她这周是常驻主持人的临时替补。
临时替代者；替补
填空题；填充物；补白；填料；（打击乐）加花；过门；（稀疏矩阵计算中的）中间结果；（产品线的）补充产品
A temporary replacement for another person, especially at work; a substitute.
临时替代者,尤其是在工作中。
A temporary replacement for another, especially at a job.
替代。
A substitution.
在稀疏矩阵计算过程中必须暂时存储的中间结果。
An intermediate result that must be stored temporarily during the course of a sparse matrix computation.
需要填补某物缺失部分的问题或谜题。
A question or puzzle in which one is expected to fill in a missing part of something.
用于连接乐句的装饰音(通常是打击乐)。
A musical embellishment (usually percussion) that is added to connect musical phrases.
填补空缺的东西。
Something added to fill a gap.
增加体积的东西；填料或填充物。
Something added to increase the size of something; padding or filler.
用于完善产品线范围或种类的产品类别。
A product category that is used to complete a range or variety of a product line.
The regular teacher was sick, so we had a fill-in for today's class.
因为常规老师生病了，所以今天上课有了一位代课老师。
用法提示：此处 fill-in 为名词，表示临时替代缺勤教师的人。
Since our goalkeeper was injured, the coach called in a fill-in from the reserve team.
由于我们的守门员受伤了，教练从预备队叫来了一名替补。
用法提示：此处 fill-in 为名词，指在危险或困难情况下替代他人的人。
The company hired a fill-in to cover for the manager during her maternity leave.
公司雇了一名临时替代者，在经理休产假期间顶替她的工作。
用法提示：此处 fill-in 为名词，表示临时填补职位空缺的人。
可数名词，常用 a fill-in for 说明替补的对象。
She is a fill-in for the regular presenter this week.
她这周是常驻主持人的临时替补。
act as 后接 a fill-in，强调临时承担他人的职务。
He acted as a fill-in while the manager was on leave.
经理休假期间，他担任临时替补。
作定语时用单数 fill-in，直接放在所修饰的名词前。
The school hired a fill-in teacher for the summer.
学校为暑期聘了一名代课老师。
grammar · medium
易错句子He is fill-in for our manager this week.
正确表达He is a fill-in for our manager this week.
fill-in 作“临时替代者”讲是可数名词，单数形式前必须加不定冠词 a/an；汉语没有冠词，容易漏掉。
grammar · medium
易错句子She is a fill-in of our teacher.
正确表达She is a fill-in for our teacher.
表示“某人的替补”时，fill-in 后接介词 for，不用 of；of 不能标明替代关系。
grammar · medium
易错句子The school needs two fill-in this week.
正确表达The school needs two fill-ins this week.
fill-in 是可数名词，受数词 two 修饰时要用复数形式 fill-ins，不能保留单数形式。
stand-in 强调“代替某人在场”，多用于演员替身或代为出席；fill-in 更常指临时补上岗位空缺的人，如代课老师、代班员工。
substitute 是中性通用词，不强调“临时”，可长期也可临时；fill-in 特指临时顶缺的人，含“临时、过渡”意味，且一般只指人。
fill in 是动词短语，“代班”须说 fill in for sb.，不能作主语或宾语；fill-in 带连字符是名词，可直接作主语、宾语。
v. (fill)
n. (fill + -er)
n. (fill + -ing)
v. (re- + fill)
n. (fill + up)
phr. v. (fill + out)
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