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。

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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。

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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。

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