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1. The octopus is a fascinating creature with tentacles that can reach up to 10 feet long.
章鱼是一种令人着迷的生物，它的触手可以伸展到10英尺长。
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2. The nacreous shell of the sea turtle is a beautiful example of natural armor.
海龟的珍珠质壳是大自然装甲的美妙例子。
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3. The nacreous coating on the surface of the pearl is a result of the pearl's unique growth process.
珍珠表面的珍珠质层是珍珠独特生长过程的结果。