Is just a chemical reaction that compels animals to breed.

不过是让动物繁衍后代的应罢了。

Studies of both animals and humans have shown that sex hormones somehow affect the stress response, causing females under stress to produce more of the trigger chemicals than do males under the same conditions.

对于动物和人类的研究都显示出性激素会在某种程度去影响面对压力的应，导致在同样的条件下，女性产生更多的致病物质。

The U.S. ambassador to Syria says the U.S. has no evidence yet the chemical weapons have been used in the conflict.

美国驻叙利亚大使表示，目前美国尚无证据证实叙利亚冲突中使用了武器。

Some of the early names referred to their chemical properties.

早期的一些名字提到了它们的特性。

The blue hue is caused by chemical reactions in plankton which produced the blue light.

蓝色荧光是由浮游生物产生应产生的。

When I left college, I worked in developing chemical dyes.

大毕业后，我从事染料的开发工作。

The disposal of chemical waste is a serious problem.

废弃物的处理是项严重的问题。

Heating this chemical compound drives off carbon dioxide gas leaving calcium oxide.

加热这种合物会驱除二氧碳气体，留下氧钙。

Output of autos, home electronics and chemicals all rose.

汽车、家用电器以及品的产出率均上升。

Way up north in the Canadian Arctic, seabirds are picking up dangerous chemicals in the ocean and delivering them to ponds near where the birds live.

在加拿大北极的北部，海鸟正在海洋中拾起危险品，并将其运送到靠近鸟类生活地的池塘。

In order to keep food looking fresh, food manufacturers used a slew of chemicals, cooper sulfate, a common pesticide, made canned peas bright green.

为了让食物看起来新鲜，食品制造商们用了大量的药品，硫酸铜，是一种杀虫剂，它能让罐装的豆子看起来很绿很鲜亮。

But increasingly these remedies do not work. Scientists say that's because lice have developed tolerance and even resistance to chemicals.

但是这些药物逐渐失去效果。科家表示，这是因为虱子产生了耐力，甚至能够抵抗这些药物。

Yeah, oh, I wanted to check the chemicals we used in the lab when we analysed those samples — was it potassium chromate and silver nitrate?

没错。对了，我想确认一下在实验室分析那些样品时使用的制剂，我们用的是铬酸钾和硝酸银，对吗？

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

香烟含有69种致癌物质。

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

所以它们会释放一种物质警告其它蜜蜂。

Each ant is armed with a chemical weapon.

每一只蚂蚁都装备了武器。

The energy density of lithium batteries has come a long way in the past few decades, but the chemical reaction on which they rely will never be able to match the energy available from the metabolisation of glucose.

在过去的几十间，锂电池的能量密集度取得了长足的发展，但是锂电池所依赖的应永远也无法产生与葡萄糖代谢所产生的能量相匹敌的数量。

In the factories, black men took the jobs white men rejected and they were exposed to a host of toxic chemicals, including asbestos.

在工厂里，黑人接受了白人拒绝的工作，他们暴露在大量有毒物质中，包括石棉。

This is because of a boom in petroleum chemical production from the U.S...

这是因为美国石油工生产的繁荣。

The scientists lowered the livers to below freezing temperatures, while flooding the tissue with antifreeze chemicals to prevent the formation of damaging ice crystals.

科家们将肝脏温度降低到冰点以下，并把防冻剂喷洒在组织上，避免造成破坏性的冰晶形成。