rationale[ˌræʃəˈnɑ:li]

n.基本原理，理论基础v. 用三段论法推论

• outstanding
• outstation
• outstay
• outstretched
• outstrip
• outvie
• outvote
• outward
• outwear
• outweigh
• outwit
• outwore
• outwork
• ouzel
• ouzo
• ova
• oval
• ovary
• ovation
• oven
• over
• over
• over
• over-
• overact