yammer
/ˈjæmə(r); `jæmɚ/ v[I, Ipr, Ip]
~ (on) (aboutsb/sth) (infml derog 口, 贬) talk noisily and continuously; complain or speak in a whining, grumbling manner 高声不停地说; 抱怨; 嘟嘟囔囔地说
I do wish they'd stop yammering on about the size of the bill. 我真希望他们别再嘟嘟囔囔地抱怨帐单的价钱了.