by-product
/ˈbaɪˌprɒdʌkt/noun
1- an incidental or secondary product made in the manufacture or synthesis of something else副产品：
zinc is a by-product of the glazing process.
锌是抛光工序中的副产品。
1.1
- a secondary result, unintended but inevitably produced in doing or producing something else副作用; 连带的结果：
he saw poverty as the by-product of colonial prosperity.
他把贫困视为殖民地繁荣附带产生的结果。