The flood of electrical activity sparked by ECT alters that chemistry.

ECT触发的大量电活动改变了这种学作用。

It gets there when you eat, it comes from you blood and from chemical reactions in your body.

只要你吃东西，就会有屁, 屁在血液中体内的学作用产生。

I can't. It's like this chemical thing, you know?

我说不出来这像是一种学作用？

This is a result of melanin in the dead skin cells reacting with oxygen creating a black color —it's not dirt.

这是死皮细胞中的黑氧起学作用生成黑点点的结果——不是脏东西。

And a big environmental change was also underway in the last half of the Eocene, thanks to the chemistry of mountain-building.

由于造山的学作用，始新世后半期也发生了巨大的环境变。

So it’s not just the snack you desire, but the smell itself is a perfect example of chemistry at work, stimulating your brain and body.

，这不仅仅是您想要的零食，而且气味本身就是学作用的完美例子， 可以刺激您的大脑身体。

Like, how a queen ant's nutrition and pheromones can chemically alter an ant embryo to either produce a soldier or worker ant based on what's needed for the colony.

比如，蚁后的营养信息是如何通过学作用改变蚂蚁胚胎，使其根据蚁群的需要产生兵蚁或工蚁。

A yearlong study of more than 400 Alzheimer's patients showed that two drugs that work differently on the brain's chemistry act well together to help slow down the disease.

一项对 400 多名阿尔茨海默病患者进行的为期一年的研究表明，两种对大脑学作用不同的药物可以很好地协同作用，帮助减缓疾病的发展。

Then came the chemical action of nature; in the depths of the seas the vegetable accumulations first became peat; then, acted upon by generated gases and the heat of fermentation, they underwent a process of complete mineralization.

然后是大自然的学作用；在海洋深处， 植物堆积物首先变成泥炭；然后，在产生的气体发酵热量的作用下，它们经历了完全矿的过程。

They also said that findings from animal cases suggest that their addiction-like behaviors happened only when they had intermittent access to sugar, believing those behaviors to come from the intermittent access, not the actual neurochemical effects of sugar.

他们还表示， 动物案例的发现表明， 只有当它们间歇性地获取糖时， 才会发生类似成瘾的行为，他们相信这些行为来自于间歇性的获取，而不是糖的实际神经学作用。