It has been shortening the service life of mines because of their low recovery ratio.
乡镇煤矿资源回收率低，严重缩短了矿井的服务年限。
However, due to the modes of feeding and thermal dissipation structure, the improper design and use have resulted in shortening the service life of LED.
但是由于馈电方式和散热结构等问题，设计使用不当会造成LED使用寿命的大大缩短。
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