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Respiratory difficulty may gradually increase with signs of upper airway obstruction, in other words, suprasternal and intercostal recession.
伴随着上呼吸道阻塞，呼吸困难可能会逐渐加重，胸部三凹征明显。
Airway obstruction is a blockage of respiration in the airway. It can be broadly classified into being either in the upper airway or lower airway.
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