1 sentence

1. 他满腹牢骚，总觉得自己受到了不公平的对待。

   tā mǎn​fù láo​sāo, zǒng jué​de zì​jǐ shòu​dào le bù gōng​píng de duì​dài.

   He is full of complaints and always feels he is being treated unfairly.

   Source: Dong Chinese Dictionary