spadework：前期的艰苦准备工作

spade,锹，铲，work,工作。引申词义前期的艰苦准备工作。

• unrequited
• unrest
• unscathed
• unscramble
• unsolicited
• unsophisticated
• unsound
• unsporting
• unstable
• unstinting
• unsuitable
• unsympathetic
• until
• unto
• untold
• untouchable
• unveil
• unwilling
• unwind
• unwonted
• unworldly
• up
• upbeat
• upbraid
• upchuck