“ON”的意思是：（放，穿，连接）上，向前，（继续）下去；使用着的；“OFF”的意思是：从…落下；离开；被取消；下班；不新鲜的。
“ON”的读音是[ ɒn ]。
“ON”造句：Eventually, you'll learn to cry that on the inside.终有一天，你会学会让泪往心里流。
“ON”造句：A fellow doesn't last long on what he has done. He's got to keep on delivering as he goes along.--Carl Hubbell, Baseball Player。靠过去完成的无法让人保有成功，必须在路上持续交出成绩。
“ON”造句：She went directly to Simon's apartment and knocked on the door.她直奔西蒙的房间，敲了敲门。
“ON”造句：It will be shown on BBC One this autumn.
“ON”造句：He has collaborated on many tracks and two soundtracks.
“OFF”的读音是 [ ɒf ]。
“OFF”造句：I feel it's done me good to get it off my chest. 我感觉吐吐苦水对我有好处。
“OFF”造句：Their first car rolls off the production line on December 16.他们的第一辆车于12月16日下线。
“OFF”造句：French soldiers squared off with a gunman at a road checkpoint.在一个公路检查站法国士兵摆开架势，准备迎战一名持枪者。
“OFF”造句：urn off the heat and set the pan aside.
“OFF”造句：TIn reality, that's not far off expectations.
不是什么的缩写。
一个是“on”，表示开。一个是“off”表示关。
off [ɔ:f, ɔf]
prep. 离开；脱落
adv. 切断；走开
adj. 远离的；空闲的
on
prep.在 ... 之上；由 ... 支撑着；在（某一天）；关于；基于
adv.穿着；向前（移动)；表示持续性
adj.表示已连接、处于工作状态或使用中；发生；值班
如turn on 打开，发动
turn off关掉，关闭；拐弯，使转变方向本回答被网友采纳
