A drop of water fell from the cup.

He is majoring in electrical engineering.

He is an expert in electrodynamics.

My new electric car is very quiet and also environmentally friendly.

He is undergoing electrotherapy for his back pain.

It's difficult to understand the principles of electrooptics.

My specialty is telecommunications.

Positive charge is a type of electric charge of matter.

He is good at playing the erhu.

He set off on a journey to the north.