When a particle is inhaled,it comes into contact with cilia of the bronchial or nasal epithelia which beat in an upwards direction to a position where the particle can be coughed up or sneezed out.

 
  • 一颗微粒被吸入,当它接触到支气管或鼻道上皮细胞的纤毛是,纤毛会向上摆动,把它送到能被咳嗽或是喷嚏带出的部位。
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