51.   In a space shuttle first, Atlantis will be propelled by three new-style main engines during liftoff.

52.   It has been the main engine of profligate spending policies that have propped up the economy but threatened to bankrupt the country.

53.   Many private economists believe that spending by both consumers and businesses, the main engine of economic growth, could remain lackluster for some time to come.

54.   One of the three main engines has a new high-pressure fuel turbopump that is built without any welds.

55.   Profits are the main engine that drives stock prices higher.

56.   The accident left the ship without electricity and its main engine power.

57.   The main engine driving the rebound has been the hope that the IMF will finally resume lending to Russia.

58.   The main engine room flooded, and the liner had to be towed to the Egyptian port.

59.   The Saturn-bound Cassini spacecraft successfully adjusted its course by firing of its main engine, NASA said.

60.   The software is compatible with most word processors as it uses Latin-based language as its main engine.