人类最早在4500年前定居在北极，靠捕捞海洋哺乳动物和鱼类生存。
Humans first settled in the Arctic a mere 4,500 years ago, surviving by exploiting sea mammals and fish.
沿海假说提出了一种以捕猎海洋哺乳动物、收集捕捞咸水鱼和使用船只为基础的经济模式。
The coastal hypothesis suggests an economy based on marine mammal hunting, saltwater fishing gathering, and the use of watercraft.
海岸假说提出了一种以捕猎海洋哺乳动物、捕捞咸水鱼类、采集贝类和使用船只为基础的经济模式。
The coastal hypothesis suggests an economy based on marine mammal hunting, saltwater fishing, shellfish gathering, and the use of watercraft.
海洋哺乳动物一般顺水而游。
是世界上最小的海洋哺乳动物。
鲸鱼和海豹是海洋哺乳动物。
在繁殖季节，南乔治亚成为地球上海洋哺乳动物最密集的群体栖息地。
During the breeding season South Georgia hosts the densest mass of Marine mammals on Earth.
对于大型海洋哺乳动物的致命一咬将会伤害到鲨鱼的下巴。
A bite that would be lethal to a large Marine mammal could damage the shark's jaws.
这些塑料是造成每年一百万只海鸟和十万个海洋哺乳动物死亡的原因。
These plastics are responsible for the deaths more than a million seabirds and 100, 000 marine mammals every year.
这些塑料是造成每年一百万只海鸟和十万个海洋哺乳动物死亡的原因。
These plastics are responsible for the deaths more than a million seabirds and 100,000 Marine mammals every year.
体型较大的鲨鱼，比如大白鲨和虎鲨，一般以大个头的海洋哺乳动物为食。
LARGE sharks, such as the Great White and Tiger, generally prey on big Marine mammals.
Tria岛的海洋生物禁猎区是用来保护某些海洋哺乳动物的。
The Marine sanctuary on Tria Island was established to protect certain Marine mammals.
从前没有人记录过这种海洋哺乳动物的学习行为短时间内在种群中扩散的现象。
No one has ever before documented the spread of a learned behavior through a population of these Marine mammals over a short period of time.
鲸鱼和其他海洋哺乳动物，鱼类甚至一些无脊椎动物依靠声音，声音在水中传播要比光快。
Whales and other Marine mammals, fish, and even some invertebrates depend on sound, which travels much farther in water than light does.
摄影师比尔·克钦格说，像其他海洋哺乳动物一样，海豹非常好奇，但同时也具有危险性。
Like all sea mammals, sea leopards are curious, says photographer Bill Curtsinger. But they can also be dangerous.
海洋哺乳动物专家和世界自然基金会(WWF)相信，现在该地区的北极熊数目在持续增长。
Marine mammal experts and the WWF believe the polar bear population in the region is increasing.
它们是真正的海洋哺乳动物，从一块浮冰到另一块，北极熊可以游上很长的距离呢！
They are true Marine mammals and can swim many kilometers from one ice floe to another.
这正是得益于一系列的保育管理，包括了国际狩猎条约和海洋哺乳动物保护条例一类的联邦保障。
This is the result of conservation management, includinginternational agreements on trophy hunting and federal safeguards like theMarine Mammal Protection Act.
鱼类和海洋哺乳动物有良好的推进系统和操纵系统，其突出的优点是效率高、噪声低。
Fish and ocean mammal have excellent propulsion and maneuvering system, whose advantages are high efficiency and low noise.
鱼类和海洋哺乳动物有良好的推进系统与操纵系统，其突出的优点是效率高、噪声低。
Fish and Ocean mammal have excellent Propulsion and maneuvering system, whose excellences are good efficiency and low yawp.
大白鲨的嘴巴和牙齿是一副功能强大的捕猎工具：猎物从小型鱼类到大型海洋哺乳动物。
Great whites have jaws and teeth that are perfect for a powerful chomp on prey ranging from small fish to large marine mammals .
之前的研究显示这些海洋哺乳动物向外发射很吵的回声时，他们就可以让听觉变得迟钝。
Previous research suggested that these Marine mammals could dull their hearing before uttering outgoing echolocation clicks, which are very loud.
尽管1966年就已经禁止捕杀蓝鲸，但是这种巨大的海洋哺乳动物数量恢复的异常缓慢。
Although hunting of the blue whale was banned in 1966, the recovery of this magnificent Marine mammal has been exceptionally slow.
有关澳大利亚一个海豚家族使用海绵捕猎的非常著名的例子，最先记录了海洋哺乳动物使用工具的情况。
And in a much-celebrated first documented example of tool use in Marine mammals, a family of dolphins in Australia USES sponges to hunt.
这些受过训练的海洋哺乳动物不仅帮助美国挽回了上百万美元的军事设备，还能够救赎生命。
Not only do these trained Marine mammals track and retrieve millions of dollars in U. s. military equipment, they are also helping to save lives.
早在该文发表前的十年间，数百万聪明的海洋哺乳动物或死于人类结网捕捉或水质污染被毒死。
In the decade before the accompanying article was published, millions of the intelligent Marine mammals were drowned in nets or poisoned by polluted waters.
早在该文发表前的十年间，数百万聪明的海洋哺乳动物或死于人类结网捕捉或水质污染被毒死。
In the decade before the accompanying article was published, millions of the intelligent Marine mammals were drowned in nets or poisoned by polluted waters.
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