xiǎojiějie xiǎogēge zài wǎngshàng hěn chángjiàn dàn zhèngshì gōngzuò yínháng yīyuàn kèhù chǎnghé bù yīdìng héshì

“小姐姐”“小哥哥”在网上很常见，但正式工作、银行、医院、客户场合不一定合适。

Terms like 'little sister' and 'little brother' are common on the internet, but they are not necessarily appropriate in formal work, banks, hospitals, or client situations.