Surface durability: The concept of durability is an important one for all backcountry travelers to understand.

地表的耐久力：耐久力是需要所有野外旅行者懂得的一个重要概念。

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The definition formulas and new calculation formulas for transverse load factors of tooth strength and surface durability are proposed.

分别提出了弯曲与接触强度端面载荷系数的定义式和新的计算式。

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Surface Durability: The concept of durability is an important one for all backcountry travelers to understand. The following natural surfaces respond differently to backcountry travel.

地表的耐久力：耐久力是需要所有野外旅行者懂得的一个重要概念。以下的自然地表对野外行进有不同的反应。

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The screen with 7H surface hardness ensures high durability and touch accuracy, even in high traffic environments.

ENGADGET: ViewSonic outs three Windows 8-certified touchscreen displays

The non-scratch touch surface is made of reinforced glass with a hardness of 5.5 Mohs, to ensure it has the durability to withstand use in schools, hospitals, and public access areas.

ENGADGET: Eizo rolls out 17-inch FlexScan T1751 multitouch monitor