问题描述：
求翻译这段话,用翻译器的请绕道,别耽误时间,谢谢啦.
A common example of such a machine is the “heat engine” which uses energy in the form of heat to produce mechanical energy. This family includes many members but, the internal combustion engine is one with which we are all familiar. Although this machine is an integral part of our every day lives, its effectiveness in converting energy is far less than we might expect. The efficiency of the typical automobile engine is around 20%. To put it another way, 80% of the heat energy in a gallon of gasoline does no useful work. Although gas mileage has increased, somewhat, over the years that increase has as much to do with increased mechanical efficiency as increases in engine efficiency itself. Diesel engines do better job, but still max out around 40%. This increase is due, primarily, to its higher compression ratio and the fact that the fuel,under high pressure, is injected directly into the cylinder at the top of the compression stroke. Gasoline engines, on the other hand, are limited to lower compression ratios because fuel enters the cylinder prior to the compression stroke.
A common example of such a machine is the “heat engine” which uses energy in the form of heat to produce mechanical energy. This family includes many members but, the internal combustion engine is one with which we are all familiar. Although this machine is an integral part of our every day lives, its effectiveness in converting energy is far less than we might expect. The efficiency of the typical automobile engine is around 20%. To put it another way, 80% of the heat energy in a gallon of gasoline does no useful work. Although gas mileage has increased, somewhat, over the years that increase has as much to do with increased mechanical efficiency as increases in engine efficiency itself. Diesel engines do better job, but still max out around 40%. This increase is due, primarily, to its higher compression ratio and the fact that the fuel,under high pressure, is injected directly into the cylinder at the top of the compression stroke. Gasoline engines, on the other hand, are limited to lower compression ratios because fuel enters the cylinder prior to the compression stroke.
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