When did you last have a period ?

你上一次月经是什么时候？

《牛津词典》

You will have a period of time to relax and then set out on your new journey.

你将有一段时间来放松，然后开始新旅程。

youdao

All signed plug-ins have a period of validity.

所有签名插件都有一个有效期。

youdao

Republicans have a plan to insure three million more Americans at a cost of sixty billion dollars for the same period.

VOA: special.2010.02.27

That means--his calculations are very different than the ones I have because he has a much longer sample period.

那表明。。。他的计算结果与我的大相径庭,因为它数据的取样跨度比我的长多了。

耶鲁公开课 - 金融市场课程节选

The interest rate has units of time, so I have to specify a time period over which I'm measuring an interest rate.

不同时间段有不同的利率,因此我必须在不同的时间段,细化不同的利率

耶鲁公开课 - 金融市场课程节选

If you're saying that basically you're going to have a period of democracy American style or whatever, I don't think that's probable.

NPR: Defining 'Complete Victory' in Iraq

Having said that, one finding from a small study I did a year ago was that all companies have a period in the innovation doldrums.

FORBES: Move up http://i.forbesimg.com t Move down

You'd have a period of time where a movie like "2001" would run for months or epic movies like "Sound of Music" would run for two years.

CNN: Special-effects master pushes new movie format