cetaceans是什么意思？

cetaceans

• n. 鲸目动物( cetacean的名词复数 )；

例句

• Missing until recently were fossils clearly intermediate, or transitional, between land cetaceans. 近期发现的化石已经可以很清晰地帮助人们了解这个问题, 以及他们之间的过渡关系.
• It is not clear whether cetaceans undergo dream sleep. 鲸类动物是否经历梦睡眠还不清楚.
• 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.

柯林斯高阶英汉双解学习词典释义

• N-COUNT
  鲸目动物
  Cetaceans are animals such as whales, dolphins, and porpoises.