He spends a lot of time for peacekeeping.

My brother works as a systems analyst.

My computer needs a new operating system.

The new apartment is equipped with the latest unit kitchen.

He is known as an excellent system operator.

My older brother works as a systems engineer.

It is important to understand the importance of health.

He is an expert in fiber optics.

Last night, I overate and suffered from indigestion.

My digestive organ is healthy.