You're always wasting energy into heat somewhere when you dochange that involves mechanical change.

当进行与机械运动有关的变化时,总会有能量变成热量而被浪费掉。

麻省理工公开课 - 热力学与动力学课程节选

They were always mobile, always going somewhere, always changing.

他们总是流动的,总有新的目的地,总是不断变化着的

耶鲁公开课 - 美国内战与重建课程节选

It's always a good first approximation, because you need to start somewhere in terms of drawing Lewis structures, but then if you go and figure out the formal charge and you just have lots of charge separation or very high charges, like a plus 2 and a minus 2 and a minus 1 all different places in the atom, what it should tell you is maybe there's a better structure.

它总是一个好的第一近似，因为在画路易斯结构的时候,你总需要一个起点，但是如果你在算出形式电荷之后,发现有很多电荷分开了,或者说有很高的电荷，比如有一个正二，一个负二，还有一个负一1,在原子的各个地方，这应该就是在告诉你,或许还有一个更好的路易斯结构。

麻省理工公开课 - 化学原理课程节选