left over

基本解释

In anticipation of the gathering, Chile sent its entire stock of highly enriched uranium — left over from a research reactor — to the United States.
预期到这次聚会，智利把其从一个用于研究的反应堆中留下的所有高浓度铀都送到了美国。
These beliefs further suggest that the desire for correctness, the very idea of better or worse in speech is what is left over from noble and humble times.
这些主张还进一步暗示：寻求正确语言表达的愿望，即话语有好坏之分这个观念本身是从有贵族贫民之分的那个时代遗留下来的。
edu.beelink.com.cn
In the case of Los Angeles Dr Stark estimates that, by dawn, the amount of pollutants left over to make smog is about 5% higher than it otherwise would have been.
以洛杉矶为例，斯塔克博士估计，到了黎明，城市上空残留下来构成烟雾的污染物数量比没有灯光照射的情况下要高出5％左右。

Upon his death, Mr.Lehman left the museum over three thousand works of art.
And if we put that in our bond here, we have 1, 2, 3 bonds, plus we have one lone pair left over.
如果我们把它们放到键里，我们有1，2，3个键，还剩下一对孤对在这里。
麻省理工公开课 - 化学原理课程节选
In this case, it's called the ionization energy, plus whatever kinetic energy we have left over in the electron.
在这种情况下，它就是电离能，剩余部分将转化为,出射电子的动能。
麻省理工公开课 - 化学原理课程节选

There should be about 30% left over, and I can use that as I please.
FORBES: I've Tracked My Expenses -- Now What?

You can refer to food that has not been eaten after a meal as leftovers.
You use leftover to describe an amount of something that remains after the rest of it has been used or eaten.