The pistons go up and down as a person stands on lever devices treadles and uses a natural walking motion.

VOA: special.2009.08.17

When farmers buy their inputs, the store worker uses a mobile phone camera to scan barcode symbols that match the product.

VOA: special.2010.05.11

Anyone who uses a device that burns fossil fuel must inspect the equipment carefully to reduce chances of carbon monoxide escaping.

VOA: special.2010.02.02

Here,he uses a set of buttons attached to a computer to make the silent robot move forward, backward or around in circles.

VOA: special.2009.12.17

"The average person who uses a computer or an electronic device blinks about a third as much as we normally do in everyday life.

VOA: special.2011.08.01

The bus uses a hybrid system that combines the hydrogen fuel cells with high power batteries.

VOA: special.2009.09.07

The scanner uses a high-speed camera placed over the conveyer belt that moves the produce along.

VOA: special.2011.06.07

Professor Wobbrock says it uses a large circular cursor instead of the traditional arrow pointer.

VOA: special.2011.04.18

The process uses a closed system to keep hair and dirt out of the milk.

VOA: special.2010.07.20

Professor Morford says signers are like English learners whose first language uses a different alphabet.

VOA: special.2011.04.13

They mean a kind of news reporting that uses an emotional style and personal opinion.

VOA: special.2009.08.28

A common design looks like a high tunnel.Unlike a greenhouse, which uses a heating system, a hoop house is heated by the warmth of the sun.

VOA: special.2009.12.22

He uses a computer notation program called Finale to put the work together.

VOA: special.2010.07.19

Again Faulkner uses a series of different voices to tell his story.

VOA: special.2010.01.10