"It's difficult to say what the reasons are." "It has happened with spare parts for important medical equipment for hospitals.

VOA: standard.2010.06.17

There are 64 combinations of three bases and I only need to describe 20, so there's combinations to spare.

三个一组的碱基产生六十四种组合,而我只需对应二十种氨基酸,所以一种氨基酸会对应不同密码子

耶鲁公开课 - 生物医学工程探索课程节选

Well, it's kind of hard 'cause spare time is hard right now.

嗯，这个有点难，现在很难有空闲时间啊。

中央公园的时光 - SpeakingMax英语口语达人

And if I want to move towers, let's say, size 5, from, to, and spare, there are the instructions for how to move it.

比如说五个吧，从这儿到那儿，中间再经过这个多余的柱子周转，关于怎么移动已经有说明了。

麻省理工公开课 - 计算机科学及编程导论课程节选

Or maybe it's not their spare time, maybe it's their regular time.

也许不是闲暇,也许就是日常生活

耶鲁公开课 - 古希腊历史简介课程节选