Decreasing in breathing frequency could improve the particle deposition efficiencies. Nonethless, decreasing respiratory volume may enhance the particle deposition efficiency.
若是减少吸入的呼吸流量，微粒子在气管内的沈积效率也会随之增加。
The smaller the particle size, the deeper the location of respiratory tract, and thus the greater the harm to humans, then the higher morbidity and mortality.
粒径越小，进入人体呼吸道的位置越深，因而对人体的危害越大，导致人们致病率和死亡率增加。
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