| 1. | Thus , even a century after darwin , these aquatic mammals remained an evolutionary enigma
因此，即使达尔文过世超过一个世纪，这些海栖哺乳类仍然是个演化谜团。 |
| 2. | A number of rare or endangered species live in the park , including tigers , aquatic mammals , birds and reptiles
许多稀有或濒危动物生活在这里，包括老虎、水生哺乳动物、鸟类和爬行动物。 |
| 3. | The disappearance of the baiji would be the first instance of a large aquatic mammal being driven to extinction since hunting killed off the monk seal around 1952
自1952年左右僧海豹由于人类狩猎而惨遭灭绝以来，白暨豚的消失是大型水生哺乳动物被赶尽杀绝的第一例。 |
| 4. | The disappearance of the baiji would be the first instance of a large aquatic mammal being driven to extinction since hunting killed off the monk seal around 1952
回答：自1952年左右僧海豹由于人类狩猎而惨遭灭绝以来，白暨豚的消失是大型水生哺乳动物被赶尽杀绝的第一例。 |
| 5. | Perhaps one useful hint about the original function of sleep is to be found in the fact that dolphins and whales and aquatic mammals in genera seem to sleep very little
也许关于睡眠的最初功能的一个有用的暗示将在种类的海豚和鲸和水生的哺乳动物似乎睡觉非常小的事实中被发现。 |
| 6. | Perhaps one useful hint about the original function of sleep is to be found in the fact that dolphins and whales and aquatic mammals in genera seem to sleep very little
或许海豚、鲸鱼和此类的水生哺乳动物睡眠极少的现象对研究睡觉的原始作用是个有益的启示，毕竟，海洋中基本无处藏身。 |
