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。

Some of the bigger firms are engaged in researches which are of such general and fundamental nature that it is a positive advantage to them not to keep them secret.

某些大公司进行的研究属于一般和基础性的研究。因此不保密对他们才有利。

In the conversion of saliva into poison, one might suppose that a fixed process took place.

人们可能认为，唾液转变成毒液，其中有固定的程序。

The slope averages about 1 in 30, but contains steep,

坡度平均约为1/30，但其中包括陡峭的，

chasms wider than the Grand Canyon and at least one mountain more than twice as tall as Everest.

比大峡谷还宽的裂缝，起码有一座山有珠穆朗玛峰的近两倍高。

Those planning a trip to remote areas, or intending to live in countries where drinking water is not readily available, should know about the various possible methods for making water safe.

那些计划去偏远地区旅行，或在饮用水不现成的国家居住的人，应该知道如何使水适于饮用的各种办法。