Wǔtái shàng nà wèi yǎnyuán ānàhū de, kàn de rén rù le mí.
The performer on stage was so graceful and lithe it was spellbinding.
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Archaic and literary — you'll see it mostly in Yuan drama and Ming-Qing fiction. 阿 here is a loan for 婀 (graceful), and 忽 acts as a grammatical particle rather than carrying meaning.
