The exhaust gas from cars pollutes the air and they waste energy.
汽车的尾气污染了空气，浪费了能源。
Commonly, people pay their attention to the energy consumption and exhaust gas in the automobile usage step.
通常人们关注的是汽车使用对能源的消耗和尾气排放问题。
Compared with normal hammers, it has a lot of advantages, such as lower noise, no exhaust gas, less vibration, high piling energy and better dynamics characteristics.
与传统打桩锤相比较具有噪声小、无污染、振动小、打击能量高等优点，符合环保要求，并具有良好的动力学特性。
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