While the medical staff manages to care for many patients, some complicated operations have had to be postponed.

It amazed him that anyone could perform such a complicated operation without the aid of a mirror.

Chapter 23 Six hundred soldiers have to learn only so much in order to carry out even the most complicated operation.

"It's a large budget and a very complicated operation."

That was a complicated operation, carried out by Marsmen who'd had experience in space.

After several minutes of complicated operations, he was ready to warp.

But could I pull this complicated operation off in that space of time?

This is an example of a very complicated magical operation, extending over centuries.

He underwent a complicated operation, and continued his treatment for a year.

It's a real complicated operation, if you think about it.