Fine particulate matter - particles smaller than 2.5 micrometers - can evade hairlike projections in the nose and trachea that trap larger particles .
细颗粒物----小于2.5微米的颗粒----能躲过鼻子和气管中绒毛的保护作用。
Airway cells that line the bronchus , from the trachea all the way to the tiny alveoli deep in the lungs , are the first cells that confront cigarette smoke , whether it is inhaled directly from a cigarette or secondhand from the environment .
On the wall to the left of the bed were dense clusters of small circulardrops flowing downward , characteristic of arterial spray as well as exhalation of blood from the trachea .
床左侧的墙壁上,满是一簇簇密集的小血滴下流形成的血痕,这是动脉和气管血液喷出的典型状态。
Because the donor trachea was stripped of cells that could cause rejection , sanchez , who suffered from tuberculosis and lost function of one branch of her trachea , avoided having to take the powerful immunosuppressant drugs that transplant patients normally require .