The motor carbon brush of radar antenna has been worn seriously due to long time service. It can not touch really.
雷达天线电机炭刷由于长时间使用磨损严重，接触不良。
Structures are always subjected to various adverse factors during its long-time service, such as fatigue, environmental corrosion, material aging, etc.
在结构长期服役期间，疲劳、环境腐蚀和材料老化等因素的作用会引起结构损伤的累积。
Structures are always subjected to various adverse factors during its long-time service, such as fatigue, environmental corrosion, material aging, etc.
在结构长期服役期间，疲劳、环境腐蚀和材料老化等因素的作用会引起结构损伤的累积。
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