候补的英文：
a canidate for a vacancy
an alternate

If you’re so down on mothers-in-law, it’s queer you’re anxious to be one yourself. The expectant mother-in-law!
你既然这么瞧不起婆婆，你自己又急于要做婆婆，这就怪了。你还是一位候补婆婆呢！

reserve block [sale of public housing unit]
候补大厦〔出售公屋〕

"I can put you on stand - by, if you like. "
如果您愿意，我可以把您列为候补。

I could put you on standby if you wish.
我可以把您列为候补，如果您愿意的话。

I'm sorry, it's fully booked. Would you like me to put you on the waiting list?
抱歉!全部订完了。给你排在候补名单上好吗?

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。

Understudy(the role of)Ophelia
排练奥菲利亚(一角)当候补演员

Jerry became a bench warmer last winter.
去年冬天杰里变成了候补球员

Replacement ammunition must pass the requirements of the declared Division as tested by the match chronograph.
候补弹药必须经由官方测速器测试并通过其申请报名组别的规定.

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。

There are a few vacancies on the second floor.
在二楼有几个空房间。

We have a vacancy for a computer programmer.
我们有一个电脑编程师空缺。

The traveller searched in vain for a vacancy at motels.
旅行者无法在汽车旅馆找到空房间。

Are there alternatives to prison?
除了监禁还有其他办法吗？

should alternately present as undulate .
激情平淡应呈波浪形交替出现。

There are two reasonable alternatives.
有两个合理的替代方案。