operate on

1.

The old man was dying. It was just and shot in the dark to operate on him.

那老人生命垂危，给他做手术只是没多大希望地试一试。

2.

The doctors decided to operate on him for the tumor.

医生们决定为他开刀切除肿瘤。

3.

Designed to operate on land, water, or in air.

长于陆海空作战的，三栖的可在陆上、水上或空中操作的

4.

The doctors shall operate on his central nervous system.

医生们将要对他的中枢神经系统动手术。