We are working on building a new communications network.

He is known as an excellent correspondent.

I bought new clothes through mail-order.

We have started selling our new products by mail-order and online ordering.

I work every day using computer communication.

He is majoring in electrical engineering.

Electric baths are a great way for relaxation and promoting health.

He is undergoing electrotherapy for his back pain.

It's difficult to understand the principles of electrooptics.

He is an expert in electrodynamics.