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and he estimated that there were more than 2,250,000 in one acre;

他估計每英畝草坪里有225萬多只蜘蛛。

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性的研究。因此不保密對他們才有利。

It comes nearer to the engines with which man has 'conquered' the air, as he boasts.

它更近乎于人類自夸的“征服”了空氣的發動機。

He must, for example, perceive an egg as a simple single solid shape,

以鳥蛋為例，觀賞者必須感覺到它是一個單一的實體形態，

while our own compulsory school attendance became law in Germany in 1642,

而我們的義務教育成為法律在德國是在1642年，

and in most cases the captive gradually quietens down and begins to accept its food.

在大多數情況下，剛捕來的象會慢慢靜下來，接著開始吃食。