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.
有些我们最熟悉的和发现最多的动物化石，如菊石等，当时都生活在海洋里。
Some of the most familiar and plentiful fossils, such as the ammonites, lived in the seas at that time.
跟踪这些生命周期长的海洋爬行动物是不可能的，因为它们漂洋过海数千公里，绝大多数的时间生活在水下。
These long-lived Marine reptiles are impossible track as they drift through thousands of kilometres of ocean, spending the vast majority of their time underwater.
跟踪这些生命周期长的海洋爬行动物是不可能的，因为它们漂洋过海数千公里，绝大多数的时间生活在水下。
These long-lived Marine reptiles are impossible track as they drift through thousands of kilometres of ocean, spending the vast majority of their time underwater.
应用推荐