insulator

n.绝缘体，绝缘子

instrument, instrumental, instrumentalist, instrumentality, instrumentation, insubordinate, insubordination, insubstantial, insufferable, insufferably, insufficiency, insufficient, insufficiently, insular, insularity, insulate, insulated, insulating, insulating tape, insulation, insulin, insult, insulting, insuperable, insuperably, insupportable, insurance, insurance broker, insurance policy, insurance premium, insure, insured, insurer, insurgent, insurmountable, insurrection, insurrectionist, int, intact, intaglio,