墙上有过一个大钟吗？

Was there a big clock on the wall?

youdao

史上有过结婚率下降和偏低的先例。

There is an historical precedent for falling and low marriage rates.

youdao

你在这个问题上有过纠结吗？

Do you struggle with this issue?

youdao

No, we call that work positive work. All right, so that means we need to put a negative sign right here, by convention.

历史上有过不同的习惯，这里我们规定,如果环境对系统做功。

麻省理工公开课 - 热力学与动力学课程节选

We talked about mitosis last time; it's described more completely in the chapter, where two cells are formed from one.

我们上节课说到过有丝分裂,在那一章里更详细的阐释了,细胞是怎么由一生二的

耶鲁公开课 - 生物医学工程探索课程节选

It's not infrequent that i'll get one or even two people raising their hand that they took Economics 252 from me.

有的时候会有一两个人,举起手说,他们上过我的经济学252号课

耶鲁公开课 - 金融市场课程节选