He was attempting to manufacture quinine from aniline, an inexpensive and readily available coal tar wasteproduct.
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。
2
The writer thinks newspapers are another big wasteproduct and he advises people to use newspapers to do some cleaning.
作者认为报纸是另一大废品，他建议人们用报纸来做一些清洁。
3
Since there is virtually no market in Europe for pork ribs——Danes considers them a wasteproduct——Denmark depends on the USA for more than 50 percent of all sales.