Until about 1902, legal food preservatives included chemicals like formaldehyde, borax and copper sulfate.

在1902年前合法的食品添加剂还包括，砂和硫酸铜。

These microbes eat copper sulfate and appear to be impossible to kill.

这些微生物靠硫酸铜存活，并且难被扼杀。

Most organic pesticides are natural toxins, like vegetable oils, hot ash soap, sulfur or copper sulfates.

大多数有机农药都是天然毒素，像植物油，热灰皂，硫磺硫酸铜。

Some of these masses displayed green veins, as if scrawled with undulating lines of copper sulfate.

有些冰块现出绿色脉管，就象那硫酸铜在上面画的波纹线条一样。

So the copper sulfate is in the water because it prevents the growth of algae and other living organisms.

水中存在硫酸铜是因为它可藻类和其他生物的生长。

In fact, in the case of copper sulfate, often used on organic apples, the organic pesticide of choice is actually more harmful to humans.

事实上，在硫酸铜的情况下，常用于有机苹果，有机农药的选择实际上对人类更有害。

The company physicians did not examine the sick but had them line up behind one another in the dispensaries and a nurse would put a pill the color of copper sulfate on their tongues, whether they had malaria, gonorrhea, or constipation.

公司的医生不检查病人， 而是让他们在药房里排成一排， 护士会在他们的舌头上放一颗硫酸铜颜色的药丸，不管他们是患了疟疾、淋病还是便秘。