求翻译：计划生育是一项国策，将来国家实行社会养老，所以独生子女家庭不必担心，再说，只养一个可优生优育。是什么意思？

Family planning is a national policy, the implementation of the future state social pension, so the one-child families do not have to worry about, say, only to support a prenatal and postnatal care.

Family planning is a matter of national policy, the future national introduction of the social pension, so families with one child did not have to worry about, and besides, only one can be healthier births.

The birth control is a national policy, future the country will implement the society to care for the aged, therefore the only child family will not need to worry, again said, will only raise one to be possible the optimum methods of child-bearing and child-rearing.

Family planning is a national policy, State social pension in the future, so the one-child families don't have to worry about, say, keeping only one aristogenesis.

Family planning is a national policy, State social pension in the future, so the one-child families don't have to worry about, say, keeping only one aristogenesis.