河水中的化学物质含量不容忽视。
香水和皮肤的天然化学物质相互作用。
防护手套可以减少皮肤对化学物质的吸收。
Protective gloves reduce the absorption of chemicals through the skin.
硝酸盐是水和土壤里天然存在的化学物质。
Nitrates are chemicals that occur naturally in water and the soil.
这家工厂因往河里排放化学物质而被罚款。
The factory was fined for discharging chemicals into the river.
重工业排放的有毒化学物质污染着我们的河流。
并非所有正常存在于活的有机体中的化学物质都是无害的。
Not all chemicals normally present in living organisms are harmless.
科学家们声称已经发现某些植物产生的化学物质有强大的抗癌功能。
Scientists claim to have identified chemicals produced by certain plants which have powerful cancer-fighting properties.
鞋子上的化学物质会恶化空气质量。
有几种化学物质取代了氧气。
这种新的化学物质还会造成神经损伤。
一旦闻到化学物质，请立即与同学交谈。
Once you smell chemicals, immediately talk with your classmates.
这些化学物质是来自核电站的受损部分。
These chemicals come from the injured parts of the nuclear plant.
毒品是一种化学物质。
化学物质的蒸发对它们的生存是必不可少的。
The evaporation of chemicals is necessary for their survival.
攻击行为似乎与许多生物结构和化学物质有关。
Numerous biological structures and chemicals appear to be involved in aggression.
有些植物释放出有臭味的化学物质来赶走昆虫。
鱼和其他食肉动物的体内会积累大量的化学物质。
The bodies of fish and other meat-eaters can build up high levels of the chemicals.
空气中弥漫的化学物质熏得我们的眼睛火辣辣地痛。
当另一种植物获得化学物质时，它就会开始释放自己不同的化学物质。
When another plant gets the chemicals, it starts to give out its own, different chemicals.
化学过程是指化学物质聚集在一起产生其他化学物质，进而产生其他物质的过程。
A chemical process is what happens when chemicals come together to make other chemicals, and therefore other things.
不同的原料由不同的化学物质构成，当你把它们放在一起加热烹煮时，其中的化学物质会变成新的化学物质，不同的成分会产生新的东西。
Your different ingredients are made of different chemicals, and when you put them together and make them hot and cook them, the chemicals change into new chemicals and the different ingredients make something new.
其中一些化学物质会赶走昆虫。
我们曾试着燃烧化学物质，观察火焰的颜色。
We once tried to burn the chemicals and watch the colors of the flames.
纸本身是由制造木材的化学物质制成的。
The paper itself is made out of the chemicals that wood is made out of.
甚至农民使用的化学物质也流入河流和湖泊。
Even chemicals that farmers use are running into rivers and lakes.
人们很早就知道，植物使用化学物质来相互交流。
It has been known for some time that plants use chemicals to communicate with each other.
植物从被吃掉的叶子中释放出化学物质。
The plant gives out chemicals from the leaves that are being eaten.
这表明这种化学物质或材料是用来制造塑料的。
This shows that the type of chemicals, or materials, is used in making the plastic.
他用来清洁仪器的化学物质与他在实验中使用的化学物质混合在一起，产生了一种亮紫色。
The chemicals he used to clean his instruments mixed with the chemicals he used in his experiment and produced a bright purple color.
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