一个家庭只有一个孩子，而祖父母只有一个孙子。
Every parent has only one child and every grandparent has only one grand-child.
此外，大部分的家庭只有一个孩子，他们从出生开始更多的是依赖父母。
Besides, most families have only one child, who depends more on their parents since born.
当父母只有能力接一个孩子去城里同住时，他们选择了她的弟弟。
When her parents could afford one child in the city, they picked her brother.
当父母只有能力接一个孩子去城里同住时，他们选择了她的弟弟。
When her parents could afford one child in the city, they picked her brother.
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