[解析]
For more than 6 million american children.
Coming home after school means coming to an empty house.
Some deal with the situation by watching TV some may hang out outside.
But All of them have something in common.
They spend part of each day alone.
They are called latch key children.
They are children who look after themselves while their parents work.
And their condition has become a subject of concern.
A headmaster of an elementary school said that there was a school rule against wearing jewelry.
However,a lot of kids had chains around their necks with keys attached.
He was constantly telling them to put them inside shirts.
But there were so many keys slowly.
He learned they were house keys.
He began talking to the children who had them.
Then he learned of the impact working couples and single parent were having on their children.
Fear is the biggest problem faced by children at home alone.
Many had nightmares and were worried about their own safety.
The most common way latch key children deal with them is by hiding.
It might be in a bathroom under a bed or in a closet.
The second is TV they'll often play it at high volume.
Most parents don't realize the effect on their children when they leave their children alone