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。

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Nonethless, the possibility of an engine fault must always be considered by investigators.

BBC: Investigators seek clues to crash