Therefore, the effective measures are to increase vaccination rate and immunity of the specific group, decrease the susceptible population and intensify epidemic monitoring.
因此，提高免疫接种率，消除免疫空白人群，开展特定人群的免疫，加强麻疹的监测是控制麻疹发病的有效措施。
But the land use structure and reclamation index will not vary obviously with an increase of population, therefore, the sediment load from the river basins will not decrease greatly.
但是，由于人口的增加，土地利用结构与垦殖指数都不会有明显的变化，所以流域的产沙不可能有大幅度的减少。
With decrease of cropland and increase of population, food problem in our country is becoming more and more severe.
随着耕地的减少和人口的增加，我国粮食问题日趋严峻。
In 2005, the absolute population of towns and cities will increase, accordingly, the absolute population of villages will decrease, and the number of old people will exceed 10 million.
2005年城镇人口绝对值将会上升，乡村人口绝对值呈下降趋势，老年人口将突破1亿人大关。
In 2005, the absolute population of towns and cities will increase, accordingly, the absolute population of villages will decrease, and the number of old people will exceed 10 million.
2005年城镇人口绝对值将会上升，乡村人口绝对值呈下降趋势，老年人口将突破1亿人大关。
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