For a long time, machine parts wear, decrease in accuracy, the paper system parts are also affected.
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That is why the machine parts wear away during use.
这就是机器零件在使用中磨损的原因。
The machine has few parts, which could wear out, meaning the aircraft needs little maintenance.
该机器配件很少，可以拆卸，这意味着它需要很少的养护。
The machine is characterized by broken than large, particle size is small, the impact of wear and tear parts are not vulnerable, broken and stable quality.
本机的特点是破碎比大，粒度小，不受易损件的磨损影响，破碎质量稳定。
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