active：活动中的，积极的，主动的

词根词缀： -act-行动 + -ive形容词词尾,表性状

• ophthalmo-
• ophthalmologist
• ophthalmology
• opiate
• opine
• opinion
• opinionated
• opinionist
• opium
• opossum
• opponent
• opportune
• opportunism
• opportunist
• opportunity
• oppose
• opposite
• opposition
• oppress
• oppression
• oppressive
• oppressor
• opprobrious
• opprobrium
• Ops