CONVENTION
（表示无趣或不重要）…啊之类的；等等；诸如此类的
You use blah, blah, blah to refer to something that is said or written without giving the actual words, because you think that they are boring or unimportant.
例句
...the different challenges of their career, their need to change, to evolve, blah blah blah.
他们的职业面临的各种不同的挑战，需要求变，需要发展，等等