This means you can vary the neutron number without changing chemical identity, because chemical identity is fixed by the proton.

这表示你可以改变中子数,而不会改变它的化学特性，因为化学特性是由质子决定的。

麻省理工公开课 - 固态化学导论课程节选

If you're not updating some variable by incrementing it or decrementing it -- if you're not changing anything, presumably the conditions are never going to evaluate to false or the opposite, so you're just going to have an infinite loop, which might be your goal, but odds are it's not.

如果你不通过增加或减少它来改变一些变量,-如果你不改变什么，大概那个条件永远不会变成错误的,或相反的，所以你将得到一个无限循环，那可能是你的目标，但可能也不是。

哈佛公开课 - 计算机科学课程节选

It's about you never really going to make a difference.

那就是，你从来都不会去做什么改变。

普林斯顿公开课 - 人性课程节选

.. What you can't change, loses-- when you focus on the fact that you can't change it, it loses some of its grip to upset you.

你无法改变的-,当你专注于”你无法改变它“这个事实，它就不会让你那么难受。

耶鲁公开课 - 死亡课程节选