opportunism

n [U] (esp derog 尤作贬义) looking for and using opportunities to gain an advantage for oneself, without considering if this is fair or right 机会主义: political opportunism 政治上的机会主义 * a record of shameless opportunism 空前无耻的机会主义历史.

operations room, operative, operator, operetta, ophthalmic, ophthalmic optician, ophthalmologist, ophthalmology, ophthalmoscope, opiate, opine, opinion, opinion poll, opinionated, opium, opossum, opp, opponent, opportune, opportunely, opportunist, opportunistic, opportunity, oppose, opposed, opposite, opposition, oppress, oppress-ively, oppressed, oppression, oppressive, oppressor, opprobrious, opprobriously, opprobrium, ops, opt, opt out of, optic,