On the edge of the paper to reduce friction, that is, reduce mechanical wear and tear, and the durability of the tool itself.

刀与纸边的磨擦力减少，即减少对机械的磨损，而刀本身的耐用性更强。

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Precautious use can protect the engine in time from mechanical damage due to reduction of wear and tear and improvement in lubrication.

预防性使用能及时保护发动机，这是由于磨损降低和润滑性改善，以减少机械损伤。

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At Nokia's San Diego test Center, the company puts every phone through a series of physical and mechanical tests to ensure it can withstand real world wear and tear.

在诺基亚的圣迭戈测试中心，该公司把通过一系列物理力学试验，以确保每一个手机能够经受住现实世界的磨损。

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Touch sensing helps increase product lifetimes by eliminating mechanical wear and tear associated with buttons and switches, while minimizing system cost by saving an extra IC in the design.

ENGADGET: Freescale's new industrial touchscreen tech even works in the rain