something that is produced as a result of making something else , or something unexpected that happens as a result of something
发音
例句
1. Freedom is the by-product of economic surplus. 自由是经济盈余的副产品。 2. The raw material for the tyre is a by-product of petrol refining. 制造轮胎的原材料是提炼汽油时产生的一种副产品。