invigilate (v.) invidious (adj.) invictus inviable (adj.) inveterate (adj.) inveteracy (n.) investor (n.) investment (n.) investiture (n.) investigator (n.) investigative (adj.) investigation (n.) investigating v. 調查；讅查（investigate的ing形式）investigates v.調查；研究investigated v.調查；研究investigate (v.) investigate vt.調查vi.作調查investigable (adj.) invest (v.) invertebrate (adj.)