The productive cough of chronic bronchitis is often not regarded as abnormal.

慢性支气管炎的咳痰往往不被认为异常.

辞典例句

This exudate gives rise to the productive cough purulent yellow sputum seen with bacterial pneumonias.

渗出引起咳脓性黄痰,如细菌性肺炎.

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