1 sentence

1. 医生正在努力寻找这种罕见疾病的病因。

   yī​shēng zhèng​zài nǔ​lì xún​zhǎo zhè zhǒng hǎn​jiàn jí​bìng de bìng​yīn.

   The doctor is working hard to find the cause of this rare disease.

   Source: Dong Chinese Dictionary