Nowadays, in China, more and more family only have one child because of the one child policy.
现在在中国，越来越多的家庭因为独生政策而只有一个孩子。
Among the children in a certain family, each child has at least one brother and at least one sister.
在某个家庭的孩子中，每个孩子至少有一个兄弟和一个姐妹。
Among the children in a certain family, each child has at least one brother and at least one sister.
在某个家庭的孩子中，每个孩子至少有一个兄弟和一个姐妹。
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