a substance that is produced during the process of making or destroying sth else 副产品◆When burnt, plastics produce dangerous by-products. 塑料燃烧时会产生危险的副产品。
a thing that happens, often unexpectedly, as the result of sth else 意外结果；副作用◆The cut in workforce has been a by-product of the company's investment in new technology. 公司投资於新技术所产生的副作用是劳动力的削减。