Spiders are busy for at least half the year in killing insects.

蜘蛛至少有半年在忙于吃昆虫。

The bank must obey its customer's instructions, and not those of anyone else.

银行必须遵照储户的嘱托办事，不能听从其他人的指令。

This result merely confirms earlier American and British studies:

结果仅仅确认了美国人和英国人早期的研究：

runs the gentle slope of the continental shelf, geologically part of the continents.

从地质学上来说，它是大陆的一部分。

and there is a virtual limit on how long we can hope to remain alive,

我们所希望的长寿实际上是有限度的。

a ticklish business which is achieved with the aid of two tame elephants roped to the captive on either side.

这是一件棘手的事，需要在它两侧拴上两头驯服的大象才能完成。