They analyzed bacteria, fungi, parasites and chemicals.

他们分析了细、、寄生虫和物质。

It was easy to get the chemicals, but he needed the bodies.

添加剂很容易得到，但是没有测试者。

It also generates reactive chemicals that attack the microbes from within.

它还能产生活性物质，这种物质能从内部攻击微生物。

That's adding a chemical to clouds to increase rain or snowfall.

它是向云中添加物质以增加降雨或降雪。

Cigarette smoke contains 69 chemicals that are known to cause cancer.

香烟含有69种致物质。

Some plants pump out smelly chemicals to keep insects away.

有些植物排出有臭味的物质来驱除昆虫。

What's the plants' motivation for producing such chemicals?

那么植物制造这样一种物质是何缘由呢?

Asthma attacks can be triggered by pollen, dust, harsh chemicals or scents.

花粉、灰尘、刺激性物质或气味可引发哮喘。

Processing meat means adding certain chemicals by curing, smoking, sorting or fermenting.

加工肉类意味着通过腌制，熏制，分类或发酵添加某些。

So, there's no harmful chemicals or oils that are left behind.

不会留下有害的物质或油脂。

There are two important chemicals found in all our brains - dopamine and acetylcholine.

多巴胺和乙酰胆碱。

Cigarette smoke contains over 4,000 toxic chemicals.

香烟烟雾里就包含有4000多种有毒的物质。

In looking at 150 different liquids, scientists found about two hundred different chemicals.

在对一百五十种不同液体进行观察后，科家发现了大约二百种不同的物质。

They use other chemicals to kill the insect pests that attack the plants.

他们还会用其他物质杀死攻击作物的害虫。

And it finds these chemicals at very low levels, usually parts per billion.

它发现的这些物质含量很低，通常是十亿分之一。

If we mix these two chemicals together, they will form an acid.

如果我们把这两种物混合在一起，他们会形成酸。

In the fields, farmers use too many chemicals which destroy the soil.

农民在田地里用了太多，破坏了土壤。

I've given him chemicals and compounds, that way he's never even noticed.

即便我给他吃的东西加料了 他也注意不到。

But the waves were not large enough to mix the chemical with the oil.

但是，海浪不够大，不足以将物质和石油混合在一起。

The receptor samples the waxy chemicals on the skin of his love interest.

这种感受器检验潜在伴侣皮肤上的蜡状物质。