The only way that they can preserve their history is to recount it as sagas -- legends handed down from one generation of another.These legends are useful because they can tell us something about migrations of people who lived long ago, but none could wri

他们保存历史的唯一办法是将历史当作传说讲述，由讲述人一代接一代地将史实描述为传奇故事口传下来。

By infecting animals and letting them loose in the burrows,

通过让染上此病的动物在洞内乱跑，

One young calf especially enjoyed raising a turtle to the surface with his snout and then shoving him across the tank like an aquaplane.

一只小海豚特别喜欢用鼻子把海龟推到水面，然后像滑水板一样把海龟从水池的这一边推到那一边。

and shows no signs at present of ceasing to rise.

并且目前尚无停止上升的迹象，

Because the gravity on the Moon's surface is only a sixth of Earth's

由于月球表面的重力仅是地球表面的1/6-

it would take about 700 years for half of us to die,

那么我们当中的一半人过700年才会死去，