Is just a chemical reaction that compels animals to breed.

不过是让动物繁衍后代化反应罢了。

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.

对于动物和人类研究都显示性激素会在某种程度去影响面对压力反应，导致在同件下，女性生更多致病化物质。

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化武器。

Some of the early names referred to their chemical properties.

早期一些名字提到了它们化特性。

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生化反应生。

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

大毕业后，我从事化染料开发工作。

The disposal of chemical waste is a serious problem.

化废弃物处理是项严重问题。

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

加热这种化合物会驱除二氧化碳气体，留下氧化钙。

Output of autos, home electronics and chemicals all rose.

汽车、家用电器以及化品均上升。

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.

在加拿大北极北部，海鸟正在海洋中拾起危险化品，并将其运送到靠近鸟类生活地池塘。

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化药品，硫酸铜，是一种杀虫剂，它能让罐装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，这是因为虱子生了耐力，甚至能够抵抗这些化药物。

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品时使用化制剂，我们用是铬酸钾和硝酸银，对吗？

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

香烟含有69种致癌化物质。

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

所以它们会释放一种化物质警告其它蜜蜂。

Each ant is armed with a chemical weapon.

每一只蚂蚁都装备了化武器。

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.

在过去几十年间，锂电池能量密集度取得了长足发展，但是锂电池所依赖化反应永远也无法生与葡萄糖代谢所生能量相匹敌数量。

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工作，他们暴露在大量有毒化物质中，包括石棉。

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

这是因为美国石油化工生繁荣。

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，避免造成破坏性冰晶形成。