例如，金不会起反应，但是在纳米尺度上它就成为了反应的催化剂。

For example, gold is nonreactive but at the nanoscale it becomes a catalyst for reactions.

youdao

萤光灯泡内有少量汞，其被加热后变成气态，与其他气体起反应形成光。

Inside a fluorescent bulb, a tiny amount of mercury is heated until it turns into a gas that reacts with other gases to produce light.

youdao

下丘脑是对瘦素起反应的最主要的大脑区域，通过传递信号来抑制食欲。

The hypothalamus is the primary brain region that responds to leptin, sending a signal that curbs appetite.

youdao

But what happens through learning is that another association develops that between the conditioned stimulus and the conditioned response.

但学习会在条件刺激与条件反应之间,建立起另一种联结。

耶鲁公开课 - 心理学导论课程节选

And I rolled up the window and before you know it " he had punched out the window."

我讲车窗门拉起,没等我反应过来,他一拳就砸在了玻璃上“

耶鲁公开课 - 心理学导论课程节选

So we can think about something I mentioned last time, which is when we're thinking about chemistry and what's really interesting in terms of chemical reactions, it's mostly valence electrons we're talking about, those are the ones that tend to be involved in chemical reactions.

我们可以考虑一下我上次提到过的一件事，那就是如果我们讨论化学,以及什么是化学反应中,真正令人感兴趣的东西，我们讨论的几乎都是价电子，它们才是在化学反应中,真正起作用的部分。

麻省理工公开课 - 化学原理课程节选