It is suggested that obstruction of upper respiratory tract by goiter and obstruction of small airways of COPD lead to combined disturbance of ventilation.

结果表明，甲状腺肿大引起的上呼吸道阻塞和COPD的小气道阻塞造成混合性通气障碍。

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Emphysema - a Disease of Small Airways or Lung Parenchyma?

肺气肿——是小气道、还是肺实质的疾病呢？

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But the real key to the merger is US Airways' comprehensive service to small cities along the East Coast.

WSJ: Little overlap in American, US Airways routes

British Airways said there had been a "very small number of cases" where people who had checked in with symptoms of H1N1 had been advised not to travel after having medical checks.

CNN: Airlines stop swine flu victims flying

Those particles are small enough to stay suspended in the air for hours, and can enter into the airways of a person's lungs, Dr McNerney said.

BBC: 10 things about the vuvuzela