Sea urchins are perhaps best known for their armor of spines. But their mouths may be even more daunting-urchin teeth can literally chew through stone without getting dull.
也许关于海胆，人们知道得最多的是它们的棘刺盔甲。但是，它们的口器可能更令人望而生畏——毫不夸张地说，海胆的牙齿可以把岩石咬碎，却永远不会变钝。
But their mouths may be even more daunting-urchin teeth can literally chew through stone without getting dull.
但是，它们的口器可能更令人望而生畏——毫不夸张地说，海胆的牙齿可以把岩石咬碎，却永远不会变钝。
Stone tools abound, but human bones from other Asian sites are almost as rare as hens’ teeth.
石制工具大量出土，但在亚洲其他地方发现的人类骸骨几乎是凤毛麟角。
The accompanying grave-goods are stone implements, jades, crocodiles' bones, beasts' teeth, pigs' lower jawbones, pottery and so on.
出土器物有玉石器、鳄鱼骨板、兽牙、猪下颌骨、陶器等。
Stone tools abound, but human bones from other Asian sites are almost as rare as hens' teeth.
还有丰富的石器，不过来自其他亚洲地方的人类骨头化石基本上是少得可以。
Yuanmou man in 1965, archeologists found two ancient human teeth and some rough stone tools in Yuanmou County, Yunnan Province.
元谋人1965年，在云南省元谋县，考古人员发现了两颗远古人类的牙齿和一些粗糙的石器。
The utility model relates to a diamond circular saw blade for cutting stone materials, in particular to a diamond circular saw blade with protection teeth.
本实用新型涉及切割石材用金刚石圆锯片，尤其是一种带保 护齿金刚石圆锯片。
The utility model relates to a diamond circular saw blade for cutting stone materials, in particular to a diamond circular saw blade with protection teeth.
本实用新型涉及切割石材用金刚石圆锯片，尤其是一种带保 护齿金刚石圆锯片。
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