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来源：百度知道 编辑：UC知道 时间：2024/05/24 09:44:21
Almost all gasoline engines work in the same way-with four movements, or strokes, of a piston in a cylinder. The first stroke pulls the fuel mixture(gasoline and air)into the cylinder. The second stroke compresses the fuel mixture. A spark plug produces a spark that ignites the fuel mixture and causes the third stroke. The final stroke removes any waste gases which might remain in the cylinder.
The preceding paragraph explains what happens inside the cylinder to make the piston move. When the piston is pushed down by the explosion in the third stroke, it pushes the connecting rod. This rod rotates the crankshaft. The cranks
The first automobile was invented more than two hundred years ago. It used steam for power and had wooden wheels. The first automobile may have been simple and primitive, but it was an extremely important invention. The automobile today is the primary means of land transportation. It has produced more changes in our daily life than any other machine.
第一辆汽车发明于两百多年前。她用蒸汽作动力，而且还有车轮是木制的。第一辆汽车可能很简陋很原始，但它确实是个机器重要的发明。今天，汽车是陆地运输的最主要的工具。它比其它任何机器都更多的改变了我们的日常生活。
Almost all gasoline engines work in the same way-with four movements, or strokes, of a piston in a cylinder. The first stroke pulls the fuel mixture(gasoline and air)into the cylinder. The second stroke compresses the fuel mixture. A spark plug produces a spark that ignites the fuel mixture and causes the third stroke. The final stroke removes any waste gases which might remain in the cylinder.
几乎所有的汽油发动机都以相同的方式工作——汽缸中的活塞有4种运动或冲程。第一冲程是将混合燃料（汽油和空气）推进汽缸中。第二冲程是压缩混合燃料。火花塞产生火花引燃混合燃料并且引起第三冲程。最后一个冲程是将存留在汽缸中的废气排出。
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