Sent_en: 2zh Dr. Michael Zimpfer, director of the Rudolfinerhaus clinic emphasized that time there was no proof yet to specify the substance causing the illness.
Sent_yy: 鲁道夫·费恩斯豪斯诊所主任迈克尔·津普弗博士强调说，目前还没有证据表明这种疾病是由什么物质引起的。