operation
/ˌɑpərˈeɪʃən/
the state of being in effect or being operative
中文释义：手术；操作；运营
The patient underwent a successful operation to remove the tumor.
患者接受了一次成功的手术以切除肿瘤。
The rescue operation was launched immediately after the earthquake.
地震后立即启动了救援行动。