风向，区域大小和吸烟者的人数影响到了暴露程度。
Wind, area size, and number of smokers affect the degree of exposure; and.
风险的程度取决于危害的严重性和暴露程度。
The degree of risk depends on the severity of the hazard and the degree of exposure.
人们可以通过限制对风险因素的暴露程度降低艾滋病毒感染风险。
Individuals can reduce the risk of HIV infection by limiting exposure to risk factors. Key approaches for HIV prevention include.
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