向前看，向上看，向下看，眨眨眼。

Look straight, look up, look down, and blink your eyes.

youdao

你可以向上看，向下看，看黑板或者看老师。

You can look up, look down, look at the board or look at the teacher.

youdao

不要向上看。

Don't look up.

youdao

But I think this is rather an implausible suggestion because, of course, you could have these glorious views just by going up in the airplane and looking down from the safety of your airplane.

但我认为这是个似是而非的建议,因为，当然，你可能只是坐飞机向上飞,并安全地向下看,就会有这些迷人的视野。

耶鲁公开课 - 死亡课程节选