鳍状肢可能确实是水生生物的必要反应，海龟、鲸鱼和儒艮也有鳍状肢。
Flippers may indeed be a necessary response to aquatic life, turtles, whales, and dugongs also have them.
它们向我们展示了进化过程中半成品的样貌，而完全进化的结果是鲸鱼和儒艮。
They show us what the intermediates might have been like, on the way to extreme cases such as whales and dugongs.
然而，从某种程度上讲，海龟并没有像鲸鱼或儒艮一样完全回到水中生活，因为它们依旧在海滩上产卵。
However, they are, in one respect, less fully given back to the water than whales or dugongs, for turtles still lay their eggs on beaches.
如今，儒艮已经被保护起来，但是它们的数目情况还是危险。
Dugongs are now protected, but their population status remains precarious.
哺乳动物中海牛目中一科包括儒艮和斯特勒儒艮。
A family of mammals of order sirenia including dugongs and steller's sea cow.
它可能是水手的美人鱼故事的启示，儒艮与大象是密切相关的。
Possibly the inspiration for mariners' tales of mermaids, dugongs are closely related to elephants.
它们中的许多都是大型哺乳动物，比如犀牛、貘、大象、儒艮和海牛。
Many are large animals, such as rhinos, tapirs, elephants, dugongs and manatees.
儒艮目前在整个范围内受到法律的保护，但其数量仍然处于贫乏的状态中。
Dugongs are now legally protected throughout their range, but their populations are still in a tenuous state.
纳布和潘克洛夫已经把儒艮身上的脂肪全部取下来，装在大陶土罐里了。
Neb and Pencroft had taken away the fat from the dugong, and placed it in large earthen POTS.
虽然儒艮的尾巴意外地有些像鲸鱼，但却与海牛有关，在外观和行为上也与海牛相似。
Dugongs are related to manatees and are similar in appearance and behavior - though the dugong's tail is fluked like a whale's.
有些人认为，儒艮是为古代美人鱼和塞任(siren)【1】航海故事的启示。
Some believe that dugongs were the inspiration for ancient seafaring tales of mermaids and sirens.
他打算揭穿那场水底战斗的秘密，证实一下究竟是什么怪兽使儒艮受到这么奇怪的创伤。
He wished to penetrate the mystery of that submarine combat, and to ascertain what monster could have given the dugong so strange a wound.
儒艮日日夜夜地吃着水下的草料，它们用多刺和敏感的鼻子来翻找，并用粗糙的嘴唇和牙齿反复不断地咀嚼这些草料。
Dugongs graze on underwater grasses day and night, rooting for them with their bristled, sensitive snouts and chomping them with their rough lips.
儒艮日日夜夜地吃着水下的草料，它们用多刺和敏感的鼻子来翻找，并用粗糙的嘴唇和牙齿反复不断地咀嚼这些草料。
Dugongs graze on underwater grasses day and night, rooting for them with their bristled, sensitive snouts and chomping them with their rough lips.
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