OSCAOffice of Senior Citizens Affairs 中等城市事务办公室； abbr.；=Office of Senior Citizens Affairs 老年人事务局OSabbr.操作系统=（Operating System）oscilloscope trace示波器描迹Osmidrosis surgery腋臭手术osphohexoisomerase磷酸己糖异构酶oscillatory-flow振荡流os suprebranchiale咽鳃骨oscillating roller振动式镇压器osmium sesquioxide三氧化二锇os mentomeckelaian颐骨oscillatory damped振荡性衰减oscillatory torque振动力矩