你兩口子30歲時生兩孩子,60歲時你兩孩子各生兩孩子,您就四個孫子。您要有幸活到90歲就8個重孫子了。這叫人口持平?
你兩口子30歲時生兩孩子,60歲時你兩孩子各生兩孩子,您就四個孫子。您要有幸活到90歲就8個重孫子了。這叫人口持平?
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