operation KK:[] DJ:[] n. 1.操作;运转[U] The operation of this machine is simple. 这个机器的操作很简单. 2.经营;营运[U] The operation of a railroad needs many men. 铁路的营运需要很多人. 3.作用;效力[U][C] The operation of natural law is constant. 自然法则的作用是永恒的. 4.活动;工作;事[C][P1] The rescue operation lasted three days. 救援活动持续了三天. 5.【医】手术[C][(+on/for)] Her father underwent a major operation last week. 她父亲上周动了一次大手术. 6.军事行动,作战[C][P1] The general was in command of operations in the north. 将军负责指挥北方的作战行动. 7.交易,买卖[C][P1] He continued his operations in cotton futures. 他继续进行棉花期货交易. 8.【数】运算[C] 9.(尤指法律文件的)生效[U]