non-不;非 nonexistent, nonsense, non-stop; non-smoker; post- 后于 post-war, postgraduate pre·先于 prepay; pre-war, pre-revolutionnon- 不；非 nonexistent; nonsense; non-stop; non-smoker; post- 后于 post-war; postgraduate; pre- 先于 prepay; pre-war; pre-revolution;