We owe a lot to the birds and beasts who eat insects but all of them put together kill only a fraction of the number destroyed by spiders.

我们要十分感谢那些吃昆虫的鸟和兽，然而把它们所杀死的昆虫全部加在一起也只相当于蜘蛛所消灭的一小部分。

since ground stations and satellites cannot see everywhere.

因为地面工作站和卫星不可能看到地球上的每一个地方。

Poison to a snake is merely a luxury; it enables it to get its food with very little effort, no more effort than one bite.

毒液对毒蛇来说只不过是一种舒适生存的优越手段，它使蛇不用费多大力气就能捕获到食物，轻咬一口即可。

probably vertical, cliffs, and gentle sediment-covered terraces,

乃至垂直的峭壁和沉积物覆盖的缓和的阶梯地带，

Such administrative overheads in a business are analogous to the cost of government in a nation.

一家企业的这种行政管理开支类似于一个国家的政府管理所用的开支。

to study his image in the sight of those who do not know him,

企图用不了解自己的人的观点来研究自己塑造的形象的作法，