未来这些日子的油价涨落概率是一半对一半。

It's a toss-up whether oil prices will go up or down over the days ahead.

《柯林斯英汉双解大词典》

我知道的例子是一半对一半。

The cases I know are half by half.

youdao

然而，如果问及选择死刑还是不可假释的终生监禁时，就变成了一半对一半。

If asked to choose between the death penalty and a life sentence with no chance of parole, however, they are evenly divided.

youdao

So part of it is, you yourselves have figured out, some of you, that you shouldn't choose a high number.

这对了一半,你们都明白了,不应该选择一个较大的数

耶鲁公开课 - 博弈论课程节选

Right? Most of them aren't,or about half of them, I think,are not in the Bible,and yet they're very important for the history of Western Civilization.

但是大多数其实并不是，至少一半不是，但是对西方文明历史,却有着极其重要的意义。

耶鲁公开课 - 新约课程节选

So halfway is the right thing to do, because at each step, I'm guaranteed to throw away at least half the list. Right? And that's nice.

一半以上的元素，对不对？，这很棒，好，大家猜猜这个算法的增长率是多少？,为什么？太对了。

麻省理工公开课 - 计算机科学及编程导论课程节选