这是一本关于海洋生物的好书，适合儿童阅读。

An excellent book about sea life for young children.

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你有没有听过有一种树木，它们是陆地动物和海洋生物的家园？

Have you ever heard of the trees that are homes over animals both on land and sea?

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然而，很多海洋生物的骨骼由一种叫作霰石的碳酸钙矿物变体组成。

In many marine creatures, however, the skeleton is composed of a mineral variety of calcium carbonate called aragonite.

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So, a natural product is something that is made by nature, and often natural products, whether it comes from a plant or a marine organism have some really good, useful properties. And so, one particular compound has anti-tumor properties. So, again, along this line of cancer research.

天然产物是在自然界中生成的,通常一个天然产物，不管是来自植物或者海洋生物,都有些非常好非常实用的性质，其中的一个特殊的化合物,可以治疗癌症,再一次我们又来到癌症研究上。

麻省理工公开课 - 化学原理课程节选