如白喉、脊位灰质炎等，常有健康病原携带者。

Like diphtheria, keel position gray matter inflammation and so on, common healthy cause of disease carrier.

youdao

如白喉、脊位灰质炎等，常有健康病原携带者。

Like diphtheria, keel position gray matter inflammation and so on, common healthy cause of disease carrier.

youdao