unsatisfactory product

• 不合格产品

unsatisfactory product的用法和样例：

例句

1. With the high quality and excellent service of its products as well as the guarantee of exchanging any unqualified product, Xin Li has built good reputation among customers.
   从严生产，从优服务，严格做到不合格产品不发运，不合格产品包退换的服务准则，由此树立了品牌的良好声誉。