non-U：不为上层阶级所接受的

non-,无，非，U,缩写自upper class,上层阶级。

• refract
• refractive
• refractometer
• refractory
• refrain
• refrangible
• refresh
• refreshing
• refreshment
• refrigerant
• refrigerate
• refrigeration
• refrigerator
• refrigeratory
• refuel
• refuge
• refugee
• refulgent
• refund
• refurbish
• refusal
• refuse
• refusenik
• refute
• regain