cetaceans的例句（cetaceans在句子中的用法）

• 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.