事实上，海洋无脊椎动物不变的外壳是通过1亿年前的沉积物发现的。
Indeed, unaltered shells of marine invertebrates are known from deposits over 100 million years old.
无脊椎类的好多物种有碳酸钙质的外壳或骨骼。
Many species of invertebrate have shells or skeletons made of calcium carbonate.
每一个人都有一个独一无二的、无法取代的裹在脆弱外壳里的灵魂。
Each of us is a unique, irreplaceable soul enclosed in a fragile shell.
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