1.
Any of various similar cetaceans, such as the killer whale.
虎鲸多种类似的鲸类动物中的任一种，如虎鲸
2.
It is not clear whether cetaceans undergo dream sleep.
鲸类动物是否经历梦睡眠还不清楚。
3.
Cetaceans reduce the number of breaths they take during rest periods.
鲸类动物在休息时减少它们的呼吸次数。
4.
Preliminary Study on Iron Accumulation and Serum Transferrin of Several Cetacean Species;
几种鲸类动物铁积累和血清转铁蛋白的初步研究
5.
Whales fall under the class of mammals.
鲸属于哺乳类动物。
6.
Any of various small whales, porpoises, or similar aquatic mammals, especially a whale of the genus Mesoplodon, having a pointed snout.
啄鲸一种小型鲸、海豚或类似的水生哺乳动物，尤指啄鲸属的一种有尖啄的鲸鱼
7.
The zoology of whales and related aquatic mammals.
鲸（类）学研究鲸和与其有亲缘关系的水生哺乳动物的动物学
8.
The whale is the largest mammal in creation.
鲸是世上最大的哺乳类动物。
9.
Whale is not a fish; it is a mammal.
鲸不是鱼类，它是一种哺乳动物。
10.
Whales are classified as mammals, not fish.
鲸鱼被划分为哺乳动物，而不是鱼类。
11.
Any of various marine cetacean mammals, such as the bottle - nosed dolphin, of the family Delphinidae, related to the whales but generally smaller and having a beaklike snout.
海豚一种海豚科海洋鲸类哺乳动物，如的宽吻海豚，与鲸近似但一般比鲸小且有喙状吻
12.
of or relating to whales and dolphins etc.
属于、关于鲸及海豚等鲸目动物。
13.
an animal oil found in the blubber of the sperm whale.
抹香鲸鲸脂中的一种动物油。
14.
small flat-bodied semi-terrestrial crustaceans: whale lice; sand-hoppers; skeleton shrimp.
小型扁体半陆生甲壳类；鲸虱；沙蚤；麦杆虫属端足类甲壳动物。
15.
One group of whales has, instead of teeth, long strips of bone, hanging from their upper jaw. This is the baleen whale, the largest animal in the world.
有一类鲸鱼，用从上颚骨垂下来的长条状的骨头代替牙齿，它就是须鲸，是世界上最大的动物。
16.
A whale is a kind of mammal.
鲸是一种哺乳动物。
17.
Whales are very smart animals.
鲸是很机灵的动物。
18.
The whale is the largest animal in the world.
鲸是世界上最大的动物。