“商业银行”的英语表达是 commercial bank 。
例句：
Commercial banks play a crucial role in the financial system by providing a wide range of banking services.（商业银行在金融体系中发挥着至关重要的作用，它们提供各种各样的银行服务。）
Many people choose to deposit their savings in commercial banks for safety and interest earnings.（许多人为了安全和获得利息收益，选择将积蓄存入商业银行。 ）