方法：采用枸椽酸钠引咳试验观察对豚鼠的止咳作用；

Methods: We adopted the cough experiment with natrium citricum to observe the effect on relieving cough of guinea-pig.

youdao

方法：采用枸椽酸钠引咳试验观察对豚鼠的止咳作用；

Methods: We adopted the cough experiment with natrium citricum to observe the effect on relieving cough of guinea-pig.

youdao