It is essential to control population increase to lighten the burden on the land, to withdraw the farmland to the grassland and to protect thd vegetation for anti-desertification.

控制人口增长、减轻土地压力、退耕还牧和保护植被是促进当地荒漠化土地逆转所必须的。

youdao

The index of population trend in treatment of spraying chemical insecticides was 7.20, The index of population trend would increase in 1.43 times against that in control.

施用化学杀虫剂的种群趋势指数（）为7.20，干扰作用控制指数为1.43，即种群趋势指数将增长为对照的1.43倍。

youdao

The population control accounts for the big difference between the increase in employment of 117, 000 and the decline in unemployment of 622, 000.

FORBES: Silver Linings In Employment Data