您要查找的是不是：
- Marine mammals generally swim with the current. 海洋哺乳动物一般顺水而游。
- Advances in Molecular Ecology of Marine Mammals. 海兽分子生态学研究进展。
- A school of marine mammals, such as seals, whales, or dolphins. 海生哺乳动物一群海生哺乳动物，如一群海豹、鲸或海豚
- The Finless Porpoise is another resident marine mammal species. 此外，江豚是另一种在本港海域栖居的海洋哺乳类动物。
- There are lots of marine mammals such as whales and seals in the sea. 海洋里有许多诸如鲸鱼和海豹类的海生哺乳动物。
- Marine mammals are wowing researchers with more than just circus tricks. 海洋哺乳动物不仅仅会马戏团特技，令研究人员倍感惊奇。
- Other methods help marine mammals to hold their breath longer than other types o f mammals can. 其他方法有助于海洋哺乳动物能比其他种类的哺乳动物更长时间地屏住呼吸。
- Marine mammals can take in more air with each breath, as their lungs are proportionately larger than those in humans. 由于海洋哺乳动物的肺成比例地大于人类，所以每次呼吸时它们能吸进更多的空气。
- Obviously sleeping safely at sea can pose problems, but the marine mammal system has addressed them. 显然安全地在海里睡觉会产生一些问题，但海洋动物的系统已解决了这些问题。
- It is actually rare for a marine mammal to drown,as they won't inhale underwater. 由于海洋动物不在水下吸气，所以它们事实上很少会溺死。
- Marine mammals can take in more air with each breath,as their lungs are proportionately larger than those in humans. 由于海洋哺乳动物的肺成比例地大于人类，所以每次呼吸时它们能吸进更多的空气。
- Obviously sleeping safely at sea can pose problems,but the marine mammal system has addressed them. 显然，安全地在海里睡觉会产生一些问题，但海洋动物的系统已解决了这些问题。
- To avoid drowning during sleep,it is crucial that marine mammals retain control of their blowhole. 为避免在睡眠时溺水，海洋哺乳动物保持对呼吸孔的控制至关重要。
- When marine mammals sleep and swim at once,they are in a state similar to napping. 当海洋哺乳动物一边睡觉一边游泳时，它们处在与打瞌睡相似的状态。
- It is actually rare for a marine mammal to drown, as they won't inhale underwater. 由于海洋动物不在水下吸气，所以它们事实上很少会溺死。
- A large marine mammal(Odobenus rosmarus) of Arctic regions, related to the seals and having two long tusks, tough wrinkled skin, and four flippers. 海象一种北冰洋一带的大型海中哺乳动物，（海象海象属），与海豹有关，长有一对长牙、粗糙的褶皱外皮及四只鳍状肢
- The second is that the traditional diet of the Inuit is extremely high in foods containing vitamin D, especially fish and marine mammals. 第二，因纽特人的传统饮食，都是维生素D含量极高的食物，特别是鱼与海洋哺乳类。
- When marine mammals sleep and swim at once, they are in a state similar to napping. 当海洋哺乳动物一边睡觉一边游泳时，它们处在与打瞌睡相似的状态。
- To avoid drowning during sleep, it is crucial that marine mammals retain control of their blowhole. 为避免在睡眠时溺水，海洋哺乳动物保持对呼吸孔的控制至关重要。
- Peninsula Valdes in Patagonia is a site of global significance for the conservation of marine mammals. 位于巴塔哥尼亚地区的瓦尔德斯半岛是全球海洋哺乳动物资源的重点保护区。
