our ancestors had gone from being preyed on by animals我們祖先從被野獸捕食

prey on捕食； 掠奪； 庇護(hù)

The decision prey on his mind.

這項(xiàng)決定折磨著他。

In those far- off times Viking pirates used to prey on the coasts of Europe.

在那些遙遠(yuǎn)的時(shí)代里，北歐海盜經(jīng)常在歐洲海岸一帶進(jìn)行掠奪。

Homo erectus might have used fire at Swartkrans in order to cook.斯瓦特克朗斯的直立人有可能用火烹煮

in order to為了

She is sieving the rice in order to sieve out the stones.

她正在把米過(guò)篩，好把石頭篩出。

She stinted herself of food in order to let the children have enough.

她自己省著吃，好讓孩子們吃飽。

suggesting that a very repetitive process had been going on there說(shuō)明這是個(gè)重復(fù)發(fā)生的過(guò)程

go on繼續(xù)；往前走；發(fā)生

Let us go on to the next item on the agenda.

讓我們繼續(xù)討論議程上的下一個(gè)項(xiàng)目。

She hesitated for a moment, and then went on.

她遲疑了一下,然后接著說(shuō)。