O字母开头的单词或词组(第1页)：

• old-fashioned
• Olympian
• opening ceremony
• organizer
• overwhelmed
• oilfield
• observational
• official-looking
• oil painting
• open the floor
• overdevelop
• overeating
• on that basis
• overweight
• oaf
• oat
• obstetrics
• offence(-se)
• officinal
• oncology
• opium
• ophthalmology
• oppression
• optics
• organelle
• orthopedics
• osteoma
• otitis
• otorhinolaryngology
• ovary
• overactivity
• overcast
• oversleeve
• ovum
• Oh,dear!
• Olympics
• orange juice
• one hundred
• opera house
• Ottawa
• orgy
• oceanarium
• overheads
• overwhelmingly