全世界有更多的儿童接受中小学教育，许多国家的人口寿命延长，婴幼儿和产妇死亡率降低。
Around the world more children are attending primary and secondary school.
人口的增加主要是因为出生率的上涨和寿命的延长。
The rise has been caused by an increase in the birth rate and greater longevity.
波出现率降低，潜伏期延长或消失；
综合性治疗使患者的生存时间延长，但不能降低病死率。
General treatment may prolong patient survival time, but not decrease the mortality.
综合性治疗使患者的生存时间延长，但不能降低病死率。
General treatment may prolong patient survival time, but not decrease the mortality.
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