原文视听

Most primates have excellent colour vision,
多数的灵长类 拥有绝佳的色彩视觉
and colour too can be used in communication.
色彩也可以用做沟通的工具
Adult Phayre's leaf monkeys might seem rather drab.
成年法氏叶猴的外表 看起来也许有点无趣
But not so their newborn.
但是新生儿是另一回事
Bright orange fur makes the babies very conspicuous,
宝宝鲜明的橘色毛发相当抢眼
so the adults can easily keep an eye on them.
所以成年叶猴 可以轻易的看到它们
Close friends and relatives
亲朋好友
are eager to help the mother with baby-sitting.
都很乐意客串保姆
It's a good chance for the younger ones to practice parenting.
年轻的猴子 可以趁机练习怎么带孩子
As a result, a baby is never left on its own for long.
因此宝宝很少落单
When it's a few months old and more independent,
几个月后小猴子变得比较独立
it will turn the colour of its mother
身上的毛色开始变得和母亲一样
and blend in with the group.
并且融入群体
But until then, it can't be ignored.
在那之前 想不看到它也难

重点解释

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。