After studying an hour, I finally got the hang of the lesson.
我學(xué)習(xí)了一個(gè)小時(shí),終于理解了這一課的要點(diǎn)。
It has been estimated that the weight of all the insects destroyed by spiders in Britain in one year would be greater than the total weight of all the human beings in the country.
據(jù)估計(jì),在英國(guó)蜘蛛一年里所消滅昆蟲(chóng)的重量超過(guò)這個(gè)國(guó)家人口的總重量。