Until July 2008 all mechanical engineering designs as well as driving gear engineering activities are executed outside China.

截止2008年7月，所有机械工程及驱动装置的设计均在国外完成。

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Gear system is the important component part of automobile and engineering machine transmission system, its operating characteristic has the most important influence for entire transmission system.

齿轮系统是工程机械系统的重要组成部分，其工作性能对整个系统有着至关重要的影响。

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To study the gear surface based on the reverse engineering.

对齿轮表面进行了逆向工程学研究。

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Aid, by contrast, is about standing on gear placements and engineering your way up steep or overhanging blank walls like El Cap, which can take days to ascend.

WSJ: Training for the Big Wall | By Michael J. Ybarra