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One day, these adult freshwater eels will return to the sea to spawn after which they'll die.
某一天，这些成熟的淡水鳗会回到海里产卵，接着就会死去
For now, they are as good as pets.
目前它们就像宠物一样
Away from the coast, animals are thin on the ground.
离海岸越远，动物就会越少
The Solomons have only a quarter of the reptiles and birds that New Guinea has.
所罗门爬行动物和鸟类的数量只占新几内亚的四分之一
For mammals like echidnas and kangaroos,
对于针鼹和袋鼠这样的哺乳动物而言
the water proved too great a hurdle.
水是一个极大的障碍
But some mammals did make it here.
然而有些哺乳动物却能成功到达这里
When it comes to reaching new islands,
对于它们而言
flying must surely have been the easiest way to get there.
登陆新岛最容易的方法就是飞行
But the 60 miles between New Guinea and the Solomons
然而新几内亚和所罗门之间相距50公里
still proved a formidable challenge for many winged creatures.
多数有翼的哺乳动物很难飞越这么远的距离
With their four-foot wingspans, giant fruit bats succeeded where other fliers failed.
依赖1米宽的翼展，巨型果蝠成功抵达其它飞行动物无法到达的地方。
