He is in his unlucky year, so he needs to be particularly careful.

He chose to discard the shadow for the substance.

He is the intellectual leader of our team, always providing new ideas.

My new keyboard makes typing very enjoyable.

Star Trek is my favorite science fiction series.

He is majoring in electrical engineering.

He returned to the scene to collect forensic evidence.

He is undergoing electrotherapy for his back pain.

It's difficult to understand the principles of electrooptics.

I am planning to go to Vancouver next week.