正式的場合請用 et cetera. (etc.) 或者 "and more related <N.>". 甚至我會建議，blah blah blah ，就都不要用，就算是很隨意、很口語的場合。 因為會給人一點點「輕浮感」。
"blah blah" 例句：
Mary's students seemingly ignored her instructions to study, and then started to play mobile games, gossiping around, and blah blah blah.
"yadda yadda" 例句：
Linus Torvalds, "I was talking about things like 'life of author+70 years' and the corporate 95-year version. That's ridiculous. Couple that with the difficulty of judging fair use etc, and it really hinders things like archival of material, making of documentaries, yadda yadda..."