■ deep down

是“在内心深处”的意思。

• Deep down he knew he was born to be a soldier.他在内心深处知道自己生来就该当军人的。

• unawares
• unaware 与 unawares
• under
• under-
• 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