Ochoa showed the journalists a black plastic lid that covered a swimming pool-size cement container of pig feces to prevent exposure to the outside air.
奥乔亚向记者带领记者参观了一个黑色塑料盖,它覆盖着一座游泳池大小的水泥猪粪池,以防止其与外界空气接触。
Wind, area size, and number of smokers affect the degree of exposure; and.
风向,区域大小和吸烟者的人数影响到了暴露程度。
Chronic exposure to more than 65 micrograms per cubic meter of any type of particle in this size range may increase risk for health problems.
长期暴露在含有超过65微克每立方米的任何颗粒的空气中,都会增加健康隐患。
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