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1.The new car has a speed reduction gear that can reduce the engine's RPM (revolutions per minute) to save fuel and improve efficiency.
这款新车配备了一个减速齿轮，可以将引擎的转速降低到节省燃油和提高效率。
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2. The engineer designed a special gear for the machine to increase its speed reduction gear ratio,which could enhance its performance.
工程师为机器设计了一种特殊的齿轮，以提高其减速齿轮比，从而增强其性能。
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3.The old car had a simple gear system with no speed reduction gear, making it difficult to accelerate quickly.
这辆旧车有一个简单的齿轮系统，没有减速齿轮，这使得加速变得困难。