As chemical pollutants break down and sink into the earth, rivers become cleaner.

随着学污染物分解并沉入地下，河流变得更加清洁。

No. They take hundreds of years to decompose – or break down by natural chemical processes.

不是的。是因为它们分解要需要几百年的时间。解是指通过学反应分解的过程。

This process of using oxygen to break down sugars into chemical energy is called cellular respiration.

线粒体利用氧气把糖分分解成学的过程叫做细胞呼吸。

And some chemical breakdown continues in the large intestine, thanks to our little bacterial farm there.

多亏了我们那里的小细菌农场，一些学分解在大肠中继续。

They can change their diets so there are fewer of the precursor chemicals that get broken down into trimethylamine.

他们可以通过改变食来减少先驱学品的摄入，而这种先驱学品会分解成为三甲胺。

And outside of being bitter, it's considered unreactive, so it's basically non-toxic and isn't destroyed by water or most other chemicals.

它被认为是惰性物质，因此基本上无毒，也不会溶于水或被大部分其他学物质所分解。

Plastics can take hundreds of years to degrade, or break down chemically.

塑料可需要几百年解或发生学分解。

Your body breaks those bonds to extract the energy, which we colloquially call " burning" .

你的身体会分解这些学键来提取量，这在口语中我们称之为“燃烧”。

In Antarctica, the ozone layer is broken down by chemical reactions in very cold, high atmospheric clouds.

在南极洲，臭氧层因极冷的高空云中的学反应而分解。

They used very elaborate apparatus, glass alembics, in which they would use heat to produce chemical decompositions.

他们使用了非常复杂的设备， 玻璃蒸馏器，通过加热来产生学分解。

The arms were originally designed for diffusing bonds making them far more dexterous than an astronaut's gloved hand.

这些手臂最初是为分解学键而设计的，因此它们比宇航员戴手套的手要灵巧得多。

While breaking down chemicals for energy is nice and all, early life did miss out on the greatest available source of energy: The Sun.

虽分解学物质的源是一件很好的事，早期生命确实错过了最大的可用源：太阳。

With most cases, the macrophage then fuses the phagosome with a lysosome which has hydrolytic enzymes that can pretty much break down any biochemical molecules.

大部分情况下，巨噬细胞会将吞噬小体和溶酶体融合到一起；溶酶体中含有水解酶可以很大程度上分解生物学分子。

These chemical bonds are incredibly difficult to break down, which means that contaminants from these chemicals build up over time in our environment.

这些学键极难分解，这意味着这些学物质的污染物会在环境中随着时间积累。

Now we don't usually think of it this way, but that is where digestion starts — the mechanical and chemical breakdown of food through chewing and enzyme-action.

我们通常不这么想，但消是从这里开始的——通过咀嚼和酶作用对食物进行机械和学分解。

Then, a little chemistry knocked the acid off, creating what was clearly an alkene, so they named it benzene, because it was an alkene that was from the benzoin resin.

后，用一点学方法将酸分解， 产生明显是烯烃的物质， 因此他们将其命名为苯，因为它是一种来安息香树脂的烯烃。

Moving through the digestive tract - down the esophagus, into the stomach, ending up in the small intestine food is chemically broken down into smaller molecules, and nutrients are absorbed into the body.

穿过消道-沿着食道进入胃部，最后进入小肠的食物被学分解成较小的分子，营养物质被吸收到体内。