Tā de tiān'éjǐng ràng xiàngliàn gèng xiǎn jīngzhì.
Her swan neck makes the necklace look even more refined.
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The swan's (天鹅) long, graceful neck is the image. Invariably paired with 直角肩 in social-media body-goal checklists. Neither appears in classical Chinese — both are modern fitness/beauty coinages.