By comparison, the fertility rate in developed countries has been stable, or falling.
By comparison, the fertility rate in developed countries has been stable, or falling.
比较而言，发达国家的生育率保持稳定或是下降趋势。
By comparison, the fertility rate in developed countries has been stable, or falling.
比较而言，发达国家的生育率保持稳定或是下降趋势。