When his cows calve each year he keeps one or two calves for his family.

每年他的母牛产犊时，他都为家里留下一两头。

《柯林斯英汉双解大词典》

I'll say 'One, two, three, go!' as a signal for you to start.

我喊“一、二、三，开始！”作为你开始的信号。

《牛津词典》

youdao

In two thousand two the group had suggested such screening tests every one to two years for women forty and older.

VOA: special.2009.11.18

How many people vote for that this is a reversible process? I've got one vote back there two votes, three votes, four votes. Anybody else?

有多少人认为,这是一个可逆过程？有一个，两个，三个,四个，还有别的人吗？

麻省理工公开课 - 热力学与动力学课程节选

so you can see that there is going to be two sets in antibonding, three sets in bonding for a net of one, giving us the single bond.

因此你能看到,反键轨道上有两组，三组成键，得到一组净成键，所以成的是单键。

麻省理工公开课 - 固态化学导论课程节选

This is an interesting one for two reasons.

FORBES: When To Fire Yourself

Along the way, Baker has run or overseen six campaigns for President: one for Ford, two for Ronald Reagan and three for the elder George Bush.

CNN: Franchise Player

The young man had several arrests, including one for assaulting two police officers in Brooklyn in 2010.

WSJ: NY dismemberment defendant dons trash bag in court