1 sentence

1. 他嘴里一直在嘟噜着什么，显然很不满。

   tā zuǐ lǐ yī​zhí zài dū lū zhe shén​me, xiǎn​rán hěn bù​mǎn.

   He kept muttering something under his breath, clearly very dissatisfied.

   Source: Dong Chinese Dictionary