by-product

名词 by-product:

1. a secondary and sometimes unexpected consequence
   同义词：byproduct
2. a product made during the manufacture of something else
   同义词：byproduct, spin-off

1. Ammonia, coal tar and coke are all by-products obtained in the manufacture of coal gas.
   氨气、煤焦油、焦煤都是煤气生产过程中的副产品。
2. An increase in crime is one of the by-products of unemployment.
   犯罪率增加是失业问题造成的一种恶果。