expansion：张开，伸展；扩张，膨胀

词根词缀：ex-出 + -pans-延伸,扩展 + -ion

• acronym
• acrophobia
• acropolis
• across
• acrostic
• acrylamide
• acrylic
• act
• acting
• actinium
• actino-
• action
• activate
• active
• activity
• actor
• actress
• actual
• actuality
• disadvantageous
• disaffect
• disaffected
• disaffiliated
• disagree
• disambiguate