You don't hear a lot about coal tar today, but back then you sure did.

今，人们很少提及焦油，但在那时，它的确热门话题。

But coal tar is toxic and hard to get rid of without harm the environment.

但焦油有毒，若不破坏环境则难以清除。

He was attempting to manufacture quinine from aniline, an inexpensive and readily available coal tar waste product.

他试图用苯胺制造奎宁，苯胺一种廉价且容易获得的焦油废料。

Some of its chemical components are the same as you find in coal tar.

其中一些化学成分与焦油中的相同。

In 1907 a chemist combined phenol— a waste product of coal tar— and formaldehyde, creating a hardy new polymer called bakelite.

1907 年， 一位化学家将苯酚（一种焦油的废品）和甲醛结合在一起，创造出一种名为电木的坚固新型聚合物。

There was lots of it around because coal gas was the primary source of light, heat and cooking fuel in most households.

当时它（焦油）很常见，因为大多数家庭照明、取暖和烹饪的主要能源。

I xk y nine from coal tar, coal tarts a thick, brown sticky substance that's produced as a byproduct when coal gas is extracted from coal.

我从焦油中提取了九种物质，焦油一种在从中提取时作为副产品产生的浓稠、棕色的粘性物质。

The word " spice" cleverly hid the industrial origins of saccharin and the fact that it was made from coal tar: a sticky dark liquid that is a byproduct of burning coal.

“香料” 这个词巧妙地隐藏了糖精的工业起源和它由焦油制成的事实：焦油一种粘稠的黑色液体，燃的副产品。

This pattern was set in 1879 when a chemist called Constantin Fahlberg was working with coal tar derivatives at Johns Hopkins University in the hope of discovering a new food preservative.

这一规律最早可追溯到 1879 年，当时一位名叫康斯坦丁·法尔贝格的化学家在约翰·霍普金斯大学研究焦油衍生物，希望发现一种新的食品防腐剂。