同义词： sirenian mammal sirenian
以上来源于: WordNet
N any sirenian mammal, such as a dugong or manatee 海牛
Sea cows were totally dependent on kelp for food, and within a decade of the onset of otter hunting, Steller noted that the islands' sea cows appeared malnourished.
海牛完全以海藻为食，在捕猎水獭开始的十年里，斯特勒注意到，岛上的海牛似乎营养不良。
ram skins dyed red and hides of sea cows; acacia wood;
染红的公羊皮，海狗皮，皂荚木
Make for the tent a covering of ram skins dyed red, and over that a covering of hides of sea cows.
又要用染红的公羊皮做罩棚的盖；再用海狗皮做一层罩棚上的顶盖。
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