顾名思义就是脖子上经常挂着钥匙的儿童，又指（父母外出打工的留守儿童）他们一般十来岁，生活在城市，因父母双亲或单亲外出学习进修或经营公司等，他们被留守在家，或是被寄托给亲戚、祖辈，成为有别于农村留守孩子的一个群体。
他是个钥匙儿童——他下课后自己进去然后等他父母回家。
He was a latchkey kid - he let himself in after school and waited for his parents to get home.
我有一位祖母级的朋友，上周我们聊天时她说道自己从前就是一个挂钥匙儿童，这样其实好处颇多。
A grandmother friend I chatted with last week told me that she had been a latch-key child and there were lots of benefits.
很多孩子都是挂钥匙儿童，所以事故不断，我们听说一个小学上在做实验室严重烧伤，而他的哥哥当时就在旁边。
Many children are latchkey kids. Accidents are frequent; we heard of an elementary school student who badly burned himself in a science experiment, with his older brother watching.
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