30种鲸，海豚和鼠海豚。
所有海豚，包括宽吻海豚，是都属于鼠海豚科。
从那时起，这些鼠海豚就没有离开过。
从那以后很久了，这些鼠海豚都没有离开过。
众所周知，鲸类动物是哺乳动物，如鲸鱼、鼠海豚和海豚。
It should be obvious that cetaceans—whales, porpoises, and dolphins—are mammals.
在德国的海上项目案例中，这些障碍目前包括天气和鼠海豚。
In the case of Germany's offshore projects, those obstacles currently include weather and porpoises.
每年超过300,000只幼年鲸鱼、海豚和鼠海豚由于商业捕捞而死亡。
More than 300 thousand small whales, dolphins and porpoises die due to commercial fishing each year.
在崎岖不平的马尔岛上，你将有机会看到的野生的鹰，水獭和鼠海豚。
Go wildlife watching on the rugged island of Mull for the chance to see eagles, otters and even porpoises.
在18世纪，鼠海豚被描述为非常普遍的，他们有时使海水变黑，因为它们生长是靠喘气。
In the 18th century, porpoises were described as so common they sometimes darkened the sea as they rose to draw breath.
最近发现的化石揭示了至关重要的它与鲸鱼，海豚，鼠海豚类水生动物之间的进化相似性。
The creature is called Indohyus, and recently dug up fossils reveal some crucial evolutionary similarities between it and water-dwelling cetaceans, such as whales, dolphins and porpoises.
虽然有些人把这些名称交替使用，鼠海豚科实际上是一个更大的群体，其中还包括像虎鲸和白鲸等动物。
Although some people use these names interchangeably, porpoises are actually a larger group that also includes animals like the orca and the beluga whale.
如果你方便的话，请来中国仔细观察可怜的鼠海豚，给我们帮助和指导以防止它们彻底灭绝。
If it is not too much inconvenient, would you please come to China to have a close observation of the poor porpoises and give us aid and direction to prevent them from dying out completely?
然而，他警告在日本的捕猎可能危害白腰鼠海豚的亚种的安全，尽管白腰鼠海豚全种在地球上有一百多万只。
Still, she cautions that it's possible that the Dall's porpoise hunt in Japan may harm subpopulations of that animal, which numbers more than a million worldwide.
不仅人们已经发现的他们杀害和弄残他们的幼仔，它们还会杀死鼠海豚，玩弄鼠海豚的尸体，并且毫无理由，似乎只为了玩耍。
Not only have they been known to kill and maim their own young, they also kill porpoises and play with their dead carcass for no apparent reason other than its fun.
除了生活在水中的哺乳动物如海豚、鼠海豚及几种海豹可以使两半大脑轮流处于睡眠和清醒的状态，大多数哺乳动物是不可以半脑睡眠的。
Not as many mammals can sleep unihemispherically; only aquatic mammals such as dolphins, porpoises, and a few species of seal can alternate sleep and wakefulness between the side of the brain.
海豚和树鼠也采用这种办法，以及人类。
系统重建分析支持海豚科和鼠豚科为单系发生，且两者构成姐妹群关系；
The phylogenetic reconstruction supported Delphinidae and Phocoenidae respective monophyletic groups, and proposed a sister relationship between these two families.
系统重建分析支持海豚科和鼠豚科为单系发生，且两者构成姐妹群关系；
The phylogenetic reconstruction supported Delphinidae and Phocoenidae respective monophyletic groups, and proposed a sister relationship between these two families.
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