the adults can easily keep an eye on them.成年叶猴可以轻易的看到它们

keep an eye on留意； 照看

He asked his neighbour to keep an eye on his house.

他请邻居照看他的房子。

Please keep an eye on the children.
请照看一下孩子们。

Close friends and relatives are eager to help the mother with baby-sitting.亲朋好友都很乐意客串保姆

be eager to热切想做, 渴望要做

He was eager to make a noise in the world.

他很想出名。

People are eager to buy government bonds.

人们急於购买政府公债。

it will turn the colour of its mother and blend in with the group.身上的毛色开始变得和母亲一样 并且融入群体

blend in融入； 调和

These buildings blend in well with the trees.

这些楼房与树木很协调。

Beat the butter and sugar; then blend in the egg.

把黄油和糖打好，然后调入鸡蛋。