2 sentences

1. 那次经济危机留下了严重的社会后遗症。

   nà cì jīng​jì wēi​jī liú​xià le yán​zhòng de shè​huì hòu​yí​zhèng.

   That economic crisis left behind serious social repercussions.

   Source: Dong Chinese Dictionary

2. 医生说，这种病如果治疗不当可能会留下后遗症。

   yī​shēng shuō, zhè zhǒng bìng rú​guǒ zhì​liáo bù​dàng kě​néng huì liú​xià hòu​yí​zhèng.

   The doctor said that if this disease is not treated properly, it may leave lasting side effects.

   Source: Dong Chinese Dictionary