Mixing up sitting and standing can be a nice option, and don't forget that not everyone has to be on the same plane.
可以选择随意就坐或是站着，没必要每个人都在一个平面上。
That's actually pretty neat because there is a nice application of this which is to try to figure out, now we know, actually how to find the tangent plane to anything, pretty much.
这个性质很漂亮，因为它有一个很好的应用，可以用来，求算很多东西的切面。
It's nice if a man can have his own plane.
一个人要是能拥有自己的飞机就好了。
应用推荐