以o开头的短语 1.当然 of course 2.在船上 on board 3.因公 on business 4.值班，值日 on duty 5.究竟 on earth 6.准时 on time 7.着火 on fire 8.在度假 on vacation 9.展览 on show = on display 10.走路 on foot= walk 11.在手边，临近 on hand 12.有时，不时 on occasion 13.故意，有意 on purpose 14.出售 on sale 15.按预定时间 on schedule 16.在……基础上 on the basis of 17.在……之上 on top of 18.再一次，又一次 once more 19.从前 once upon a time 20.一个接一个 one after another 21.相互 one another 22.相反 on the contrary 23.大约，左右 or so 24.代表 on behalf of 25.下班 off duty 26.不时地 off and on 27.上气不接下气 out of breath 28.失去控制 out of control 29.脱离危险 out of danger 30.过时 out of style 31.无秩序的/发生故障out of order 32.看不见 out of sight 33.失业 out of work 34.不协调 out of step 35.提供某人某物 offer sb. sth. =offer sth.to sb. 36.在去...路上 on one's way to… 37.再一次 once again 38.一个接一个 one by one 39.对……施行手术 operate on 40.应该 ought to 41.反复、再三over and over again 本文来源：https://www.wddqw.com/doc/b3cac3a09dc3d5bbfd0a79563c1ec5da51e2d664.html