没人知道现在有多少人在网上冲浪。

No one knows how many people currently surf the Net.

《柯林斯英汉双解大词典》

比如，你知道现在这么多学生背着的背包最初是为军队设计的吗？

Did you know, for example, that the backpacks that so many students carry today were originally designed for the military?

youdao

我低下头，看着自己交叠在柠檬水瓶上的双手，不知道现在该做些什么。

I looked down at my hands wrapped around the lemonade bottle, not sure what to do now.

youdao

So when I expand this gas adiabatically and it cools down, why do you think it might cool down?

现在我们知道了气体绝热膨胀时,温度会下载，为什么会降温？

麻省理工公开课 - 热力学与动力学课程节选

But it was there for over a thousand years, and we now know things to be a little different.

但是，它存在了超过1000年，我们现在知道的事情有点不一样。

麻省理工公开课 - 固态化学导论课程节选

So, we know now that we have charged particles. Are these negatively or positively charged based on this evidence?

弯曲的角度,现在我们知道,阴极射线是带电粒子,但从这个实验？

麻省理工公开课 - 化学原理课程节选