When burnt, plastic produces dangerous by-products.
塑料燃烧时产生出危险的副产品。
《牛津词典》
2
One of the by-products of unemployment is an increase in crime.
失业带来的一大恶果是犯罪率上升。
《牛津词典》
3
Occurrences of food shortages and droughts are causing famine and distress in some areas, and industrial and agricultural by-products are polluting water supplies.