Because PM2.5 can enter human respiratory system, even penetrate through lung cells into the blood circulation, it bring worse harms to human health.
其中细颗粒物(PM 2.5)由于能够进入人体呼吸系统，甚至能穿透肺细胞进入血液循环，从而对人体健康造成更大的危害。
M. pulmonis is not only an important pathogenic organism to laboratory rats and mice, but also is an extremely suitable model organism to study pathogenesis of human respiratory system.
肺支原体是实验大鼠和小鼠的重要致病微生物，所导致的鼠呼吸系统支原体病也是研究人类呼吸系统感染的动物模型。
A new set of air-quality evaluation standards under discussion is likely to include readings of PM2.5, the tiny airborne pollutants that cause haze and can damage the human respiratory system.
一套新的空气质量评估体系拟把PM 2.5检测值纳入其中。PM 2.5是造成天气阴霾，并能损害人体呼吸系统的微小空气污染物。
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