求翻译：但实行计划生育后，目前独生子女数量和比例都是最多的，中国独生子女目前1亿2000万，比例高达近四分之一，随着第一代独生子女进入育龄期，这一比例还会迅速攀升。如此高的比例在世界上是绝无仅有的。是什么意思？

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However, after the current one child family number and proportion of all, China is the largest number one child is currently 120 million, this ratio was as high as almost a fourth of the Child, as the first generation to enter childbearing years, this proportion is rising rapidly. Such a high propor

China in 1980 started to implement the only child policy

But after the implementation of family planning, currently only child is up to number and proportion of China one-child currently 120 million, up to nearly one-fourth, with the first generation only children access to child-bearing age, this proportion will rise quickly. Such a high proportion is un