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

他试图用苯胺批量制造奎宁，苯胺是一种廉价且容易获得的煤焦油废料。

youdao

Due to the fact that the unreasonable product structure affects the economic benefit of the mine, and caus the waste of coal resources.

由于产品结构不合理影响全矿经济效益，造成煤炭资源的浪费。

youdao

Large amount of poisonous gas, coal and waste rocks badly influence the safe product for coal mine, and also cause the economic loss to our country.

煤与瓦斯突出产生大量的煤与矸石和有毒的瓦斯气体，严重影响煤矿安全生产，给国家造成或大或小的经济损失。

youdao

Originally they were derived from coal-tar, the black viscous waste product left over from distilling coal for gas.

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