An expectorant is a type of medication that helps loosen and remove mucus and phlegm from the lungs and airways. Expectorants work by thinning the mucus, making it easier to cough up and clear from the respiratory system. These medications are commonly used to relieve symptoms of cough associated with respiratory conditions such as the common cold, bronchitis, and pneumonia.

“expectorant”的英语定义和含义

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