1 sentence

1. 他为自己当初的冲动行为感到十分懊悔。

   tā wèi zì​jǐ dāng​chū de chōng​dòng xíng​wéi gǎn​dào shí​fēn ào​huǐ.

   He felt very remorseful for his impulsive behavior back then.

   Source: Dong Chinese Dictionary