Why, you may wonder, should spiders be our friends?

你可能会觉得奇怪， 蜘蛛怎么会是我们的朋友呢？

It overran a whole continent.

整个澳洲兔子成灾。

and it is only in the seas and rivers, and sometimes lakes, where mud and sit have been continuously deposited,

所以只有在泥沙不停淤积的海洋和江河里，有时在湖泊里，

The child learning to see, first distinguishes only two-dimensional shape;

正在学看东西的儿童起初只会分辨二维形态，

His telescopic observations are justly immortal;

伽利略用望远镜所作的观察确实是不朽的，

A run-down watch is still a watch and can be rewound.

手表停了依然是只手表，还可以重上好发条。