on and off
1. 断断续续地
He has been working here, on and off, for two years.
他在这儿断断续续工作了两年。
on and on
1. 继续不停地
We walked on and on.
我们不停地走。
习惯用语and so on1.等等be on at1.不断地找岔[唠叨]be on it1.[美口]准备就绪; 决定动手做; 熟练(某事)be on to1.知道; 识透; 对某人找岔子; 与...联系[商谈]get on to1.知道; 识透; 对某人找岔子; 与...联系[商谈]have sth. on sb.1.掌握某人的一些事实[证据]just on1.差不多neither off nor on1.优柔寡断的; 三心二意的; 没有关系的off and on (=on and off)1.断断续续地; 不规则地on and after1.自...起, ...以后on and on1.继续不断地on with1.穿戴上; 开始; 继续