[lāo lāo dāo dāo]
talk nineteen to the dozen; babble on and on; constantly repeat ...; din into sb. [sb.'s] ears; go on [about at]; pick at; repeating over and over again; say over and over again; talk unnecessarily [annoyingly]
chatter interminably
唠唠叨叨说个没完
There is no need to pick at him all day long. He's a child after all.
不要老是对他唠唠叨叨， 他毕竟还是个孩子嘛!
She's always going on about her various illnesses.
她老是唠唠叨叨地诉说她患的多种疾病。