I字母开头的单词或词组(第18页)：
- imp
- immure
- impact
- implication
- implicate
- impair
- implausible
- implant
- impinge
- impervious
- imperturbable
- impertinence
- impermeability
- impersonate
- impermeable
- impermanent
- imperial
- imperious
- implicit
- impetus
- improvident
- impetuous
- implement
- imperative
- imprint
- impromptu
- impressed
- impressionable
- impression
- imprecise
- impoverish
- imposture
- impostor
- impose
- imposing
- importune
- implode
- import
- impolitic
- implore
- imponderable
- impresario
- incantation
- impregnable