■ under-

这是一个很有用的前缀，用了它，往往可以行文更为简短。

• The FDA has long been underfunded and understaffed. (US News & World Report, Sept. 15-22, 2008, p.27)药物食品管理局长期以来一直经费短缺，人手不足。

• dose
• do so
• do so
• do so
• double
• doubt
• doubt
• doubtful
• doubtful 与 dubious 均可以表示：
• doubt 与 suspect
• dove
• dove 与 pigeon
• down
• downhill
• down south
• down the road
• down your way
• do you think suppose
• do 与 make
• dread
• dreadful
• dread 与 afraid
• dress
• dressmaker
• drive