如果你在没有电话或指南针的情况下迷路了，你真的找不到北，有一些技巧可以帮助你导航回到文明世界，其中之一就是跟随陆地。

If you get lost without a phone or a compass, and you literally can't find north, a few tricks to help you navigate back to civilization, one of which is to follow the land.

youdao

当你的眼睛里有物理或化学物质的时候，没有人愿意放弃你流下的大量额外的眼泪。

Nobody wants to give up the flood of extra tears you produce when you get something physical or chemical in your eyes.

youdao

夏日时光是个帮你积累有益的黄金时期，因为你有了更多的时间，没有像工作或学校里那么容易分心。

Summertime’s also a great time to take stock of your friendships, since you have more time and aren’t as distracted by work or school.

youdao

We don't always want to go and solve the Schrodinger equation, and in fact, once we start talking about molecules, I can imagine none of you, as much as you love math or physics, want to be trying to solve this Schrodinger equation in that case either. So, what Lewis structures allow us to do is over 90% of the time be correct in terms of figuring out what the electron configuration is.

我们并不想每次都去解薛定谔方程，而且实际上，一旦我们开始讨论分子，我可以想象,你们中没有一个人，不管你有多么热爱数学或物理，会想去解这种情况下的薛定谔方程,总之，路易斯结构能让我们,有超过，90%，的概率判断出正确的,电子排布。

麻省理工公开课 - 化学原理课程节选

You can use this to express possession or a lack of possession of anything. Tangible or intangible.

你可以用它来表示你有或没有什么东西。有形与无形的事物都可以通用。

I have 课堂 - SpeakingMax英语口语达人