Cetaceans reduce the number of breaths they take during rest periods.
鯨類動(dòng)物在休息時(shí)減少它們的呼吸次數(shù).
互聯(lián)網(wǎng)
It is not clear whether cetaceans undergo dream sleep.
鯨類動(dòng)物是否經(jīng)歷夢(mèng)睡眠還不清楚.
互聯(lián)網(wǎng)
Missing until recently were fossils clearly intermediate, or transitional, between land cetaceans.
近期發(fā)現(xiàn)的化石已經(jīng)可以很清晰地幫助人們了解這個(gè)問題, 以及他們之間的過渡關(guān)系.
互聯(lián)網(wǎng)
Any of various similar cetaceans, such as the killer whale.
須鯨類;露脊鯨;長須鯨; 藍(lán)鯨;座頭鯨.
互聯(lián)網(wǎng)
Although limited to a skull , the Pakicetus fossil provides precious details on the origins of cetaceans.
盡管只是個(gè)頭蓋骨, 但它卻提供了研究原始鯨類動(dòng)物起源的珍貴信息.
互聯(lián)網(wǎng)