Something extremely rare and precious, like the horn of a qilin or the beak of a phoenix; refers to unique and invaluable items.
博物馆里展出的那枚古老徽章，制作精美，存世稀少，堪称麟角凤嘴。
The ancient badge displayed in the museum, exquisitely crafted and rarely seen in existence, can be called something as rare and precious as a qilin's horn and a phoenix's beak.
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