求翻译：亲爱的jane,关于你来信问你为什么没有兄弟姐妹现回复如下：一，中国人口增长过快；二，大部分中国家庭都是独生子女；三，20世纪80年代中国实行了计划生育。是什么意思？

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dear Jane, with regard to your letter to me asking why you do not have brothers and sisters, our reply is as follows: a Chinese population growth; 2, most Chinese families have only one child; 3, during the 1980s China had introduced family planning.

Dear jane, receives a letter about you asked why you don't have brothers the sisters presently to reply as follows: One, China population growth excessively quickly; Two, the majority of Chinese family all is an only child; Three, 1980s China has implemented the birth control.

Dear Jane, your letter asking why don't you have any brothers or sisters replies are as follows: first, China's population is growing too fast, and second, most Chinese families are only children; and, in the mid 1980 of the 20th century: implementation of family planning.