在奥陶纪，大多数生命都生活在海洋里，所以海洋生物，例如三叶虫、腕足类动物与笔石动物的数量在此时急剧减少。
During the Ordovician, most life was in the sea, so it was sea creatures such as trilobites, brachiopods and graptolites that were drastically reduced in number.
海豚是动物。他们生活在海洋里。他们有和人一样的热血，像人一样地呼吸空气和给孩子喂奶。
Dolphins are animals. They live in the sea. They have warm blood, breathe air and feed their babies with milk, just like humans.
珊瑚石：珊瑚石，珊瑚是一种生活在海洋里体态玲珑，色彩高雅的腔肠动物，名曰珊瑚虫。
Coral rock: coral rock, coral is a kind of life in the sea posture is exquisite, colour elegant coelenterate, called polyps.
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