I'm about to count to three.

我就要倒数三秒了。

I'm about to 实战 - SpeakingMax英语口语达人

This is our row and at the count of three we're going to see who's going to run.

我们用这排,数到三的时候,我们来看一下谁会参选

耶鲁公开课 - 博弈论课程节选

So on the count of three, anybody who's entering this election is going to stand up.

那么在我数到三的时候,谁想要参选就站起来

耶鲁公开课 - 博弈论课程节选

Count of three, you're just going to go or not.

数到三,你们是否要参选

耶鲁公开课 - 博弈论课程节选