That means it is easier for planes with only two engines to strike a flock of birds and lose power in both engines.

VOA: special.2009.04.01

High levels of sulfur in diesel made from petroleum have meant diesel engines produce a strong smell.

VOA: special.2010.11.17

Captain Chesley Sullenberger reported that both of his plane's engines had struck birds.

VOA: special.2009.04.01

There were no special materials to block the noise of the engines.

VOA: special.2010.10.06

I asked one of the workers if he could start the engines.

VOA: special.2010.07.31

And it starts a new business. So they are the engines of economic growth throughout the world."

VOA: standard.2010.01.31

The volcano has sent a massive cloud of microscopic ash particles swirling across northern Europe - particles that air specialists say are highly abrasive and could cause aircraft engines to fail.

VOA: standard.2010.04.16