preceding：在前的，前述的 

词根词缀：pre-前,先 + -ced-行走,退让 + -ing

• impedance
• impede
• impediment
• impedimenta
• impel
• impending
• impenetrable
• impenitent
• imperative
• imperator
• imperatorial
• imperceptible
• imperfect
• imperial
• imperialism
• imperialist
• imperil
• imperious
• imperishable
• imperium
• impermanent
• impermeable
• impermissible
• impersonal
• impersonate