language transfer：语言迁移（学习者在学习其它语言时用本语言代入）

即语言迁移，例如学英语的时候标注汉语发音。

• underwear
• underwhelmed
• underwrite
• undesirable
• undiminishable
• undo
• undoubtedly
• undress
• undue
• undulate
• undulation
• undutiful
• unearth
• unearthly
• uneasy
• unedifying
• unemployment
• unequal
• unequivocal
• unerstand
• unexceptionable
• unexceptional
• unexpected
• unfair
• unfit