steam engine
 蒸汽機
 Steam en·gine An engine moved by steam.
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 nder. A marine engine, or the engine of a locomotive, is said to run forward when its motion is such as would propel the vessel or the locomotive forward. Steam engines are further classified as double-cylinder, disk, semicylinder, trunk engines, etc. Machines, such as cranes, hammers, etc., of which the steam engine forms a part, are called steam cranes, steam hammers, etc. See Illustration in Appendix.
 Back-acting steam engine, or Back-action steam engine, a steam engine in which the motion is transmitted backward from the crosshead to a crank which is between the crosshead and the cylinder, or beyond the cylinder.
 Portable steam engine, a steam engine combined with, and attached to, a boiler which is mounted on wheels so as to admit of easy transportation; -- used for driving machinery in the field, as thrashing machines, draining pumps, etc.
 Semiportable steam engine, a steam engine combined with, and attached to, a steam boiler, but not mounted on wheels.
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 steam engine
      n : external-combustion engine in which heat is used to raise
          steam which either turns a turbine or forces a piston to
          move up and down in a cylinder