1.child作“小孩,儿童”解时,其年龄范围比较宽,可指自出生至成年前的孩子,一般指从2岁至14岁的孩子,不分男孩女孩; child还可作“子女,孩子”解,无年龄限制,不分男女。
2.child是可数名词,可充当主语、宾语、定语。
3.children构成所有格加“'s”。

child's play
极其简单〔容易〕的事 very easy challenge〔task〕
Assembling that do-it-yourself furniture is child's play—as long as you read the plans correctly!把那套自己可以完成的家具装备起来是极容易的事——只要正确看清图样就可以了。

Most children have an appetite for learning.多数孩子都有强烈的求知欲望。
The children are pleased by the charm of the zoo.动物园的迷人特色使孩子们很高兴。
His kindly bearing caused all the children to like him.他的和蔼态度使所有的孩子都喜欢他。
The children are too young to be allowed out at night.孩子们太小,夜间不能让他们出去。
The children have been acting up all day, and I'm exhausted.这个孩子一直闹了一天,把我弄得筋疲力尽。
The nurses in the kindergarten never lose their temper even if the children are very naughty.即使孩子十分淘气,幼儿园阿姨也从不发脾气。
Young children should rather be allured to learning by gentleness and love, than compelled to learning by beating and fear.对小孩子应该通过温柔和爱来诱导他们学习,而不能用打和恐吓强迫他们学习。
I watched the children play on the lawn.我看着孩子们在草坪上做游戏。
There are plenty of toys to amuse the children with while we're out.我们不在家时，有足够的玩具供孩子们取乐。
Mother allows the children to play outside until dark.母亲允许孩子们在室外玩到天黑。
They often give talks, advising children to acquire hygienic habits.他们常常告诉小孩,让孩子们养成良好的卫生习惯。
The government is responsible for the provision of education for all the children.政府有责任向所有儿童提供教育。
He keeps a firm grip on his children.他对孩子们管得很严。
Please announce to the children that there will be no school this afternoon.请向孩子们宣布今天下午不上学。
These desks and seats can be adjusted to the height of any child.这些桌椅可随儿童身高来调整。
They advertised for a young girl to look after the children.他们登广告想招聘一位年轻姑娘来照顾孩子们。
The cold was more than the children could bear.严寒使孩子们几乎难以忍受。
The doctor was associated in the child's mind with injections and pains.在孩子的脑海里,医生总是使他联想到打针与疼痛。
The children's faces brightened up when they saw their parents appear at the gate of the kindergarten.当孩子们看到家长们出现在幼儿园门口时,都喜形于色。
Buy the children's shoes big enough to allow room for growth.孩子的鞋要买得大些,以便脚长大。
The cruel man abandoned his wife and children.这个狠心的男子抛弃了他的妻子和儿女。

child's play, children's play
这两个短语的意思并不相同:child's play的意思是“容易的事”“不重要的事”,它通常用作不可数名词；而children's play的意思是“儿童戏剧”,是可数名词,其复数形式是children's plays。例如:
It was child's play to solve that problem.
解决那问题是非常容易的。
All the children like to watching children's plays.
所有的孩子都喜欢看儿童戏剧。
child, baby, boy, infant, lad
参见baby条。
下面两个句子意思不同:
She is more a child than a woman.
与其说她是一位成年妇女，还不如说她是一个孩子。
She is more child than a woman.
她具有成年妇女的风韵。

他非常高兴他妻子终于有了孩子。
［误］  He is overjoyed that his wife is finally with a child.
［正］  He is overjoyed that his wife is finally with child.
那女人带着一个孩子。
［误］  The lady is with child.
［正］  The lady is with a child.
［析］  be with child意为“怀孕”; with a child意为“带着一个孩子”。

［同义词］   baby, infant
［词源］  ＜古英语cild(小孩)