op/ɔp; ɑp/ n(infml 口) = operation 3. op (also Op), abbr 缩写 = opus Beethoven's Piano Sonata No 30 in E major, Op 109 贝多芬E大调第30号钢琴奏鸣曲, 作品第109号.
牛津英汉双解词典