在与非洲已呈上升趋势的脊髓灰质炎流行进行斗争一年之后，主要受影响国家的卫生部长们今天得出结论，认为大多数国家中脊髓灰质炎的扩散正在放慢。
Following a year in which Africa grappled with an escalating polio epidemic, ministers of health of the key affected countries today concluded that the spread of polio was slowing in most countries.
本文分析了影响大气污染物扩散的各种因素，讨论了主要因素对大气污染物扩散的影响趋势。
The various affecting atmospheric pollutants diffusion is analyzed and the effect tendency of primary factor to atmospheric pollutants diffusion is discussed.
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