Tā shēnduàn ānàhū, zǒu qǐ lù lái xiàng liǔtiáo yíyàng.
Her figure was willowy - she walked like a swaying willow branch.
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Archaic and literary, seen 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.