Avoid all products and souvenirs made from animals, including all fur, ivory, shells, seahorses, teeth, rhino horn and turtle shell products.

拒绝一切用动物做成的产品和纪念品，包括皮草，象牙，贝壳，海马，动物牙齿制品，犀牛角和龟壳制品。

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In the past decade, powerful new X-ray scans and three-dimensional computer models have transformed the analysis of bones, teeth, and shells.

过去十年间，新型X光扫描和计算机三维模型已经改变了人们对骨骸、牙齿和外壳的分析方式。

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The Greeks, and then the Romans, improved the recipes for toothpaste by adding abrasives such as crushed bones and oyster shells, which were used to clean debris from teeth.

先是希腊人，然后是罗马人，将牙膏的配方加以改进。他们添加了一些磨料如碎骨和牡蛎壳，用来清除牙齿上的污垢。

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