One possible reason is that dust can affect the breathing system and people may be more open to infection.
原因之一可能是尘埃会影响呼吸系统以及人们的户外活动多，因而感染病毒。
One possible reason is that dust can affect the breathing system and people may be more open to infection.
其中一个可能的原因是灰尘能够影响呼吸系统，人们更易受到感染。
OBJECTIVE To improve the quality of dust alleviation work, cut off transmission routes, and prevent nosocomial infection effectively.
目的提高保洁工作质量，切断传播途径，有效地预防医院感染。
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