Alas! The way of learning from teachers has long been lost.
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history
嗟 is a classical sighing exclamation that does not stand alone in modern speech. It survives in fixed literary phrases like 嗟乎 (alas!) and the idiom 嗟来之食 (food handed out with contempt). Modern Chinese uses 唉 for sighing instead.
register
Classical and literary only. You will see 嗟 in old prose and chengyu, not in everyday conversation.
