■ congratulations

这个意为“祝贺”的名词，必须用复数形式（祝贺的原因前面用介词 on）。

• Let me offer you my congratulations on your success.请让我对您的成功表示祝贺。

• 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
• used to
• valuable