Harmony is indeed invisible in sense Number 1, you cannot see it with your eyes, but for all that, it can be destroyed.

和声用无形的第一种解读方式理解，确实是无形的，你看不见它，但是它可以毁灭。

耶鲁公开课 - 死亡课程节选

Just the look in people's eyes when you can explain something to them

就看着你给他们讲解东西时候他们的眼神

重新开始学业 - SpeakingMax英语口语达人

Everybody in this row close their eyes so you can't look around you.

这排的同学把眼睛闭上,这样你们就看不到周围了

耶鲁公开课 - 博弈论课程节选

There is no..You're like everybody else in my eyes.

别误会，我对大家一视同仁。

麻省理工公开课 - 电影哲学课程节选