opossum

(US also possum / 5pCsEm; `pBsEm/) n type of small American or Australian animal that lives in trees and carries its young in a pouch 负鼠（产於美洲或澳洲）.

operating system, operating-table, operating-theatre, operation, operational, operations room, operative, operator, operetta, ophthalmic, ophthalmic optician, ophthalmologist, ophthalmology, ophthalmoscope, opiate, opine, opinion, opinion poll, opinionated, opium, opp, opponent, opportune, opportunely, opportunism, opportunist, opportunistic, opportunity, oppose, opposed, opposite, opposition, oppress, oppress-ively, oppressed, oppression, oppressive, oppressor, opprobrious, opprobriously,