residual and waste product

• 副产品

residual and waste product的用法和样例：

例句

1. The powder salt is a by-product of the well and rook salt factory.
   摘要粉盐是井矿盐厂中副产品。
2. Sugar and its byproduct are the basis of the island's economy.
   糖及其副产品是这个岛国经济的基础。