The delicate surgical operation took five hours.

这精细的外科手术花了五个小时。

When you are facing a surgical operation.

当面对做外科手术之前。

In his case a simple surgical operation is indicated.

他的病情表明需要做一次简单的外科手术。

AIM: To improve the quality of surgical operation.

前言：目的：提高外科手术质量。

Compare the effect of four surgical operation methods.

比较四种不同的手术疗效。