cost of parts used
... 使用借款 loan for use 使用零部件成本 cost of parts used 使用者的成本 user cost ...
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减小了衔接部位，减少零部件，简化了组装工序，增强稳定性，延长使用寿命，可降低成本。
The linking places are reduced, the components are reduced, and the assembling procedure is simplified. The stability is enhanced, and the service life is prolonged. The cost can be reduced.
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