impetus

n.刺激；动力

impermeable, impermissible, impersonal, impersonality, impersonally, impersonate, impersonation, impersonator, impertinence, impertinent, impertinently, imperturbability, imperturbable, imperturbably, impervious, imperviousness, impetigo, impetuosity, impetuous, impetuously, impiety, impinge, impious, impiously, impish, impishly, impishness, implacable, implacably, implant, implantation, implausibility, implausible, implement, implementation, implicate, implication, implicit, implicitly, implied,