I find young people exciting.They have an air of freedom,

我觉得年轻人令人振奋，无拘无束。

and even so, some starting data has to guessed,

既使是这样，有些开始时的资料也不得不依靠推测，

How it came about that snakes manufactured poison is a mystery.

蛇是怎样产生毒液的，这是一个谜。

The great advantage of taking medicine is that it makes no demands on the taker beyond that of putting up for a moment with a disgusting taste,

对服药人别无其他要求，除了暂时忍受一下令人作呕的味道外，

Because the Moon has only an eightieth of the Earth's mass,

因为月球的重量只有地球的1/8，

Elephants like to have one master just as dogs do,

大象和狗一样，喜欢有一个专一的主人，