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How many spiders are engaged in this work no our behalf?

有多少蜘蛛在為我們效力呢？

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.

某些大公司進行的研究屬于一般和基礎(chǔ)性的研究。因此不保密對他們才有利。

Moreover, as soon as new knowledge is acquired, it is now turned to practical account.

而且，新知識一旦獲得，便得到實際應(yīng)用。

From the seventeenth-century empire of Sweden,

從17世紀瑞典帝國

We can perhaps forgive those who said the moons of Jupiter were produced by Galileo's spyglass if we recall that in his day, as for centuries before, curved glass was the popular contrivance for producing not truth but illusion, untruth;

如果我們回想一下伽利略之前幾個世紀期間，曲面鏡一直是一種用于產(chǎn)生幻影而不是產(chǎn)生真象的把戲裝置，那么我們就會原諒那些當時把伽利略觀察到的木星衛(wèi)生說成是伽利略用他的小望遠鏡變出來的人們，

and another 700 for the survivors to be reduced by half again.

剩下的一半人再過700年，才會又減少一半。