■ 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。

• anyone have
• anyone 与 any one
• anything
• anything but
• any time
• anytime
• anytime 与 any time
• any way
• anyway
• anyway 与 any way
• apart from
• apology
• apparent
• appeal
• appear
• apply
• appraise
• appraise 与 apprise
• appreciate
• apprise
• approve
• approve of
• approve 与 approve of
• a quick study
• archive