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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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