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翻译下面术语1、gear 2、spring 3、cam 4、lever 5、coupling 6、clutch 7、subassembly 8. shaft9.rivet 10.machinery

翻译句子The most common machine element is the gear, which combines the feature of the wheel and the lever to form a toothed wheel.

翻译句子The hardness of a gear determines its ability to resist wear.

翻译句子Manufacturing engineers have centered their efforts on the development of standardized elements.