2 sentences

1. 医生的诊断非常对症，找出了病根。

   yī​shēng de zhěn​duàn fēi​cháng duì​zhèng, zhǎo​chū le bìng​gēn.

   The doctor's diagnosis was spot-on and identified the root cause.

   Source: Dong Chinese Dictionary

2. 医生手术切除了肿瘤，彻底除去了病根。

   yī​shēng shǒu​shù qiē​chú le zhǒng​liú, chè​dǐ chú​qù le bìng​gēn.

   The doctor surgically removed the tumor, completely eliminating the root cause of the illness.

   Source: Dong Chinese Dictionary