expansion：张开，伸展；扩张，膨胀

词根词缀：ex-出 + -pans-延伸,扩展 + -ion

• cosmos
• cosponsor
• cosset
• cost
• costal
• costard
• textbook
• textile
• textual
• texture
• thalamus
• thallium
• thallus
• Thames
• than
• thanato-
• thanatology
• Thanatos
• thank
• thankful
• thankless
• thanks
• thanksgiving
• thank you
• that