1 sentence

1. 他这种忘恩负义的行为让所有曾经帮助过他的人都感到寒心。

   tā zhè zhǒng wàng'ēn​fù​yì de xíng​wéi ràng suǒ​yǒu céng​jīng bāng​zhù guo tā de rén dōu gǎn​dào hán​xīn.

   His ungrateful behavior disheartened everyone who had once helped him.

   Source: Dong Chinese Dictionary