[] 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.公司投资于新技术所产生的副作用是劳动力的削减。