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。

Is just a chemical reaction that compels animals to breed.

不过是让动繁衍后代的化学反应罢了。

For bioluminescence, creatures require two unique chemicals.

为了发光，需要两种独特的化学质。

Now, how did you discover these chemicals?

你们是怎样发现化学品？

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

香有69种致癌化学质。

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

它还能产活性化学质，这种化学质能从内部攻击微。

They analyzed bacteria, fungi, parasites and chemicals.

他们分析了细菌、真菌、和化学质。

Because MDMA affects serotonin, a nervous system chemical.

这是因为MDMA会影响一种名为“血清素”的神经系统化学质。

Pieces of hair can take in this chemical.

毛发会吸收这种化学质。

Fertilizer is a chemical that helps plants grow.

化肥是一种帮助植长的化学质。

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

多巴胺和乙酰胆碱。

Never use harsh chemicals that can discolor the boot.

千万不要使用强效化学质，以免靴子褪色。

They like the chemicals from a person's body.

它们喜欢人体中的化学质。

Industries pollute rivers by dumping poisonous chemicals into them.

工业企业向河流倾倒的有毒化学质，污染了水源。

A train derailment earlier this month spilled toxic chemicals.

本月早些时候，一列火车脱轨，泄漏了有毒化学质。

The airbags contain a chemical that could make them explode.

气囊内有能够造成爆炸的化学质。

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

它是向云中添加化学质以增加降雨或降雪。

They contain a harmful chemical that caused my liver to fail.

药里有一种能导致肝功能衰竭的有害化学质。

Carrying the hurt or anger of an offense leads the body to release stress chemicals.

满怀冒犯后的伤害或愤怒会导致身体释放压力化学质。

Exercise releases endorphins which are natural feel-good chemicals in the body.

运动可以释放内啡肽，这是一种让人感觉良好的天然化学质。