on

a.连接上 prep.在…上；靠近 ad.向前，继续

Olympic Games, Olympics, OM, ombudsman, omega, omelet, omelette (also omelet), omen, ominous, ominously, omission, omit, omni-, omnibus, omnipotence, omnipotent, omnipresent, omniscience, omniscient, omnivorous, on (the/an) average, on a large scale, on a level with, on a river, on a small scale, on a weekly (daily basis), on account of, on an average, on an even keel, on and off, on average, on balance, on behalf of, on board, on business, on condition that, on credit, on cue, on diet, on display,