A practical demonstration of such system can be seen here.

I hadn't made any practical demonstrations to Kelson before today.

He was eager to see the first large-scale practical demonstration of his new shields.

Thirty hours later I got a practical demonstration of what "in imminent" meant.

This was a very practical demonstration of why the Army trained people to be disciplined.

"I was thinking more of a practical demonstration," she said.

I agree, but it's amazing what a difference a little practical demonstration can make.

Always try to give a practical demonstration of how to use the programme.

This challenge is a practical demonstration of wireless power transmission.

He and his mine are the practical demonstration of what could have been done.