to talk or write a lot about something, often in a way that is annoying

I spent 700 words whanging on about how happy I am that she's found love. 我写了700多个字，喋喋不休地说我是多么高兴她找到了爱情。

She's always wanging on about the same old things. 她总是喋喋不休地谈论同样的旧事。