operating system

controlling computer program that organizes the running of a number of other programs at the same time 操作系统.

open-hearted, open-minded, open-mindedness, open-mouthed, open-plan, open-work, opencast, opener, opening, opening night, opening-time, openly, openness, opera, opera-glasses, opera-house, operable, operate, operatic, operatically, operating-table, operating-theatre, operation, operational, operations room, operative, operator, operetta, ophthalmic, ophthalmic optician, ophthalmologist, ophthalmology, ophthalmoscope, opiate, opine, opinion, opinion poll, opinionated, opium, opossum,