5.whales use their own inbuilt sonar system to navigate.
鲸用自身声呐系统确定航行方向。
6.Most whales have ctenoid teeth.
大部分鲸都有栉状。
7.Whales are mammals that live in the sea.
鲸是生活在海洋中哺乳动物。
8.There are lots of marine mammals such as whales and seals in the sea.
海洋里有许多诸鲸和海豹类海生哺乳动物。
9.dolphins and whales can't help taking in the odd gulp of brine as they swallow a fish.
海豚和鲸在吞时候难免会偶尔喝进一大口海水。
10.pilot whales can go to 600 metres in a dive lasting 18 minutes.
领航鲸一次下潜可达600米持续18分钟。
11.working on the sea and spotting whales seemed like a great gig.
在海上找鲸似乎是一项重大任务。
12.Whales, seals, penguins, and turtles have flippers.
鲸、海豹, 企鹅和海龟均有鳍形肢。
13.The unicorns of the sea, Monodon monoceros are members of the order Cetacea, along with whales, dolphins and porpoises.
身为海洋中独角兽，它们与鲸、海豚和鼠豚一样，属于鲸类纲目。
14.A marine biologist then sets out to destroy the creature by training two killer whales to go after the slimy menacer.
一个航海专家开始训练两只鲸去打败这只威胁者。
15.The results also suggested beaked whales (Ziphiidae) and bowhead whale (Balaena mysticetus) had a relatively closer affinity.
分析还提示喙鲸与须鲸类弓头鲸具有较近亲缘关系。
16.In 1996, for example, Belize, Colombia, Costa Rica, Italy, Japan, Mexico, Panama, Vanuatu and Venezuela were all under American embargo for beastliness to whales or dolphins.
In 1996, for example, Belize, Colombia, Costa Rica, Italy, Japan, Mexico, Panama, Vanuatu and Venezuela were all under American embargo for beastliness to whales or dolphins.
属于哺乳动物。
复数）
观点；若发现问题，欢迎向我们指正。
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鲸
和海豚
