He was running while holding a bag.

He always carries an umbrella around.

These two parts have interchangeability.

These two software are completely interchangeable.

Education about sex is very important.

Free software plays an important role in enhancing the convenience of computers.

My company is working on the development of a new vaccine software.

Software engineering is a field of study related to the design and development of computer programs.

He always supports my opinion.

I carry my lunch box every day.