And finally number 1, chemical substances.

最后是第一个，化学物质。

So they emit a chemical substance that alerts the other bees.

所以它们会释放一种化学物质警告其它蜜蜂。

The test includes a nose swab, a chemical substance and a testing strip.

这项检测需要鼻拭子、一种化学物质和一个检测条。

The next step will be to synthesize a chemical substance from the molecule.

接下来就是人工合成分子中的化学物质。

From studies, we know that corals and other marine species contain chemical substances.

从研究中，我们知道珊瑚和其他海洋物种含有化学物质。

Anaesthesia. This chemical substance can greatly reduce pain during surgery when a doctor must cut into your body.

麻醉。这种化学物质可以极大地减轻手术期间医生必须切开你的身体时产生的疼痛。

The WHO last week said the medicine had unacceptable amounts of chemical substances that can cause kidney damage.

世界卫生组织上周表示，该药的化学物质含量“不可接受”，可能导致肾脏损伤。

To help ourselves and others, it's important to know something about drugs. A drug is a chemical substance.

为了帮助自己和其他人，了解毒品相关知识非常重要。毒品是一种化学物质。

There was no evidence found except for a piece of paper with the names of chemical substances on it.

除了一张写有化学物质名称的纸之外，没有发现任何证据。

So, if you're wondering, a generic drug is a pharmaceutical that contains the same chemical substances as a brand-name drug.

仿制药是指含有和品牌药相同的化学物质的药物。

A pheromone is a chemical substance produced by an animal that influences the behavior of another animal of the same kind.

信息素是动物产生的化学物质，能影响其他同类动物的行为。

Last week, the WHO said the medicines produced by Maiden Pharmaceuticals had unacceptable amounts of chemical substances that can cause kidney damage.

上周，世卫组织表示，梅登制药公司生产的药品中含有不可接受的化学物质，可导致肾脏损害。

" DNA" is the chemical substance that carries the genetic information.

” “DNA” 是携带遗传信息的化学物质。

" Rat poison" is a chemical substance that will kill rats.

“老鼠药”是一种能杀死老鼠的化学物质。

If you combine the short names of the chemical substances on the paper, you'll get a name, Ni C O LA S.

如果你把纸上化学物质的简称组合起来，就会得到一个名字——Ni C O LA S。

Poison is something, some substance, some chemical substance often, that kills you.

毒药是某种东西，某种物质，通常是某种化学物质，会杀死你。

The diagnosis was contact dermatitis. What does that mean? That there was some kind of agent, a chemical substance that caused this reaction.

诊断结果是接触性皮炎，这是什么意思？某种作用剂，一种化学物会产生这种反应。

People can be addicted to all sorts of behaviors as well as chemical substances.

人们可能会对各种行为以及化学物质上瘾。

It's a noun, it means a chemical substance made up of atoms of one kind, or a particular or basic part of something.

它是一个名词，意思是由一种原子组成的化学物质，或某物的一个特殊或基本部分。

Yes - it's red because of rust - a reddish chemical substance called iron oxide that occurs when metals react with water and air.

知道，它呈红色是因为铁锈——一种被称为氧化铁的红色化学物质，当金属与水和空气反应时会产生氧化铁。