铸铁划线平台使用磨损后，可以重新修刮恢复其精度。
Cast iron crossed platform, can use wear to restore its precision.
雷达天线电机炭刷由于长时间使用磨损严重，接触不良。
The motor carbon brush of radar antenna has been worn seriously due to long time service. It can not touch really.
“没有什么是永远存在的！”然而，在这个陈述中，我们想到的是人工制造的技术性物体和产品，它们在使用过程中受到自然磨损。
"Nothing lives for ever!" However, in this statement we think of artificially produced, technical objects, products which are subjected to natural wear and tear during use.
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