O字母开头的单词或词组(第3页)：

• on the other side
• on the battlefield
• of special note
• on an equal base with
• object lesson
• over the horizon
• over millennia
• of the day
• off course
• oil refining
• only that
• over time
• operational mine
• organic food
• or whatever
• on various occasions
• original version
• originate from
• order of magnitude
• on their way
• open ended
• oblivion
• obsolescence
• obtrusive
• omen
• optimal
• outburst
• outrageous
• out-tray
• outage
• organ donor
• on and off
• outpatient
• of itself
• on the basis of
• obligee
• obligor
• offeree
• offerer
• open-end
• opportunity cost
• out-of-stock
• outward(s)
• overdraft