武漢肺炎擴散快 日專家：五成被無病徵患者傳染

<img src="https://static.rti.org.tw/assets/thumbnails/2020/01/16/2541cfcf395b64a00a553157acec5f1c.jpg" width="360" alt="日本國內出現首起新型冠狀病毒肺炎病例。...