Imagine a steel cylinder(汽缸，泵筒体)with no openings except two tiny ones where fuel and oxygen enter.The fuel burns and gas is formed. This gas expands, pushing equally in all directions. Pressure becomes so great that, unless it is relieved, the cylinder will burst.

　　But before the steel cylinder can burst, the end opposite the fuel intake is suddenly opened and the hot gases rush out. More gases are formed instantly as the fuel continues to burn. The gases push against all parts of the cylinder except for the open end. This causes the cylinder to move away from the open end where there is no pressure.

　　Passage Two

　　As supplier of most of the food we eat and of raw material for many industrial processes, agriculture is clearly an important area of the economy. But the industrial performance of agriculture is even more important than this. For in nations where the productivity of farmers is low, most of the working population is needed to raise food and few people are available for production of investment goods or for other activities required for economic growth. Indeed, one of the factors related most closely to the per capita income (人均收入)of a nation is the fraction(一部分)of its population engaged in farming. In the poorest nations of the world, more than half of the population llives on farms. This compares sharply with less than 10% in western Europe and less than 4% in the United States.

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