■ everyday 与 every day

前者是形容词。

• an everyday occurrence每天常见的事情，家常便饭。

后者是状语词组。

• It happens every day.这是天天都发生的。

• underestimate
• undersell
• unhuman
• unilateral
• unilateral 与 one-sided
• uninterested
• union
• unite
• united states
• university
• unless
• unlike
• unload
• unsatisfied
• until
• until
• until
• uphill
• up north
• upon
• upper
• up to
• up to now
• up to now 与 until
• use