- Stephen? - No.

-斯蒂芬 -不要

...that... that proves the universe had a beginning? Is that it?

证明宇宙是有开端的

there is a freedom to add a constant to the definition of the potential.

可以加上任意一个恒量来定义势能

including the stuff I've hidden under the board,

包括黑板后面的东西

Okay, so we saw last time that Lewis wasn't so dumb.

我们知道路易斯并不愚蠢

there was an octet of electrons around the nucleus.

原子核周围有八个电子

if you're talking about the length of the vector A.

这是约定俗成的

that a is the square root of (Ax)^2 + (Ay)^2.

显然有 A 等于 (Ax)^2 + (Ay)^2 的平方根

that are mathematically way over my head.

令我头大的数学题了

which we all learned in high school.

我们中学里都学过的

unless everything just falls together or blows apart.

除非所有的物质都结合起来或者发生爆炸

there can be no local maximum

在真空中不存在最大