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鲎,是一种奇特而又稀少的“丑八怪”。它的一些形态,很像六亿年前的三叶虫,所以人们称它为“活化石”。从它身上,又发现了一种能用于医疗诊断的特殊物质,那就是:
Oh, it is a strange and rare “ugly”. Some of its forms resemble trilobites 600 million years ago, so people call it a “living fossil.” From it, another special substance that can be used for medical diagnosis is found: