vaporware：雾件（已做广告但上未上市的计算机程序或产品）

比喻用法，计算机术语。比较wetware.

• underling
• underlying
• undermine
• underneath
• underpass
• underpin
• underscore
• undersecretary
• undershoot
• understand
• understanding
• understudy
• undertake
• undertaker
• undertaking
• under the rose
• underwear
• underwhelmed
• underwrite
• undesirable
• undiminishable
• undo
• undoubtedly
• undress
• undue