女士 (nǚshì) is a polite and formal term for "lady" or "Ms." used to address or refer to women respectfully. It is common in formal contexts, customer service, and written language, similar to the English "madam" or "Ms."
这位女士,请问您需要什么帮助?
Zhè wèi nǚshì, qǐngwèn nín xūyào shénme bāngzhù?
Excuse me, ma'am — how may I help you?
女士们先生们,欢迎来到我们的音乐会。
Nǚshìmen xiānshēngmen, huānyíng lái dào wǒmen de yīnyuèhuì.
Ladies and gentlemen, welcome to our concert.
王女士今天下午会来签合同。
Wáng nǚshì jīntiān xiàwǔ huì lái qiān hétong.
Ms. Wang will come to sign the contract this afternoon.