Because of the high speed with which it is executed, it is a very difficult technique to block.

This is one of the more difficult photographic techniques to master, as the movement must be smooth, and at the correct speed.

Simple mechanical processes are preferred over more difficult techniques such as welding and soldering.

Later, the monitor learns more difficult techniques of medical diagnosis, going into the complex cells of the human body.

His work is remarkable in form and imagination, using difficult techniques approachable only by masters of the art.

Ayla was feeling better, looser, ready to try the more advanced and difficult technique.

What makes it a difficult technique to use is that there is rarely a perfect analog for an event in the future.

"The most difficult technique is to try to make the homus sound like it's speaking with a human voice," he said.

He would apply a more advanced and difficult technique to this one.

Pixar sometimes creates short animated films that use a difficult or untested technique.