Shāngyèyínháng de zhǔyào yèwù shì xīshōu cúnkuǎn hé fāfàng dàikuǎn.
The main business of commercial banks is taking deposits and issuing loans.
Tips
usage
Contrast with 中央银行 (central bank, i.e. the PBOC), 政策性银行 (policy banks like 国开行), and 投资银行 (investment bank). The 'Big Four' 商业银行 are 工商银行, 建设银行, 农业银行, 中国银行.
mistakes
行 here is yínháng (bank), NOT yínxíng. The character 行 reads xíng meaning 'to walk / ok', but in 银行/行业/行列 it shifts to háng.