precision：精确(性)，精密(度)

词根词缀：pre-前 + -cis-切 + -ion名词词尾

• undiminishable
• undo
• undoubtedly
• undress
• undue
• undulate
• undulation
• undutiful
• unearth
• unearthly
• uneasy
• unedifying
• unemployment
• unequal
• unequivocal
• unerstand
• unexceptionable
• unexceptional
• unexpected
• unfair
• unfit
• unflagging
• unflappable
• unflattering
• unflinching