最近的研究显示，日本的车在免维修这一点上，仍超过美国车。
Recent studies show that Japanese cars are still more maintenance free than American cars.
本发明涉及一种换热效率高、节能环保、免维修的不锈钢热交换器。
The invention relates to a stainless steel heat exchanger with high heat exchange efficiency, energy conservation, environmental protection and free maintenance.
除了叶轮之外，高压鼓风机没有其他动作，因此可靠性之高几乎免维修。
In addition to the impeller, the high-pressure blower has no other action so the reliability of it is that it almost needs no maintenance.
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