电子设备故障率最高的部分总是位于维修最不易到达的区域。
In electronics repair the part with the highest failure rate will always be located in the least accessible area of the equipment.
研究表明：加工中心机床本体故障率最高，刀库与机械手是其可靠性最薄弱的环节。
The study indicates that the tool magazine and the mechanical arm are the weakest point of the reliability in making the breakdown rate of the host machine so high.
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