1973年，中国在全国范围内实行计划生育，从1973年到1995年2月，中国人口由9亿增加到12亿，每增加1亿人口所需时间，又延长到7年左右。

• In 1973,China began to promote family planning throughout the country. China's population increased from 900 million to 1.2 billion in the period from 1973 to February 1995,and the time needed for the population to increase by 100 million was again lengthened to around seven years.