HSK 5
哎
āi叹
hey!; (interjection used to attract attention or to express surprise or disapprobation)
哎，你的书还在桌子上。
Āi nǐ de shū hái zài zhuō zi shàng.
Hey, your book is still on the table.
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New in the HSK 3.0 word list at level 5.