我知道这听起来很古怪，但是我当时与朋友聊得太投入了，没有注意到天变暗了——暗得不是太明显，只是足以让人察觉。

I know this sounds weird, but I was so interested in my friends, I didn't even notice the sky had gotten darker- not much, just enough.

youdao

最好的捷径是寻找宇宙中一天体运行到另一天体与观察者之间，使前者如同经过后者的表面，使我们从地球上观察到的光线变暗。

The best approach is to look for transits, in which an orbiting planet passes in front of its star, dimming the amount of light we detect on Earth.

youdao