Most cars have four forward gears.

大多数汽车有四个前进挡。

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Author has summed up and put forward two kinds of practical design method of pitch curves of non-circular gears.

通过研究，作者归纳、总结并提出了两种实用的节曲线设计方法。

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New technology that altering temperature and low pressure carburization is put forward in allusion to low quality and high cost of gears.

针对耐磨构件，尤其是齿轮等机械构件质量低和生产成本高的现状，提出变温低压渗碳新工艺。

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You've slammed through the first three forward gears, shifting at 7, 000 to 8, 000 rpm each time, and suddenly you're blowing past 100 mph.

FORBES: Vehicles Feature

With 406 pound-feet of torque and eight forward gears, the diesel chortles and snorts to 60 mph in 7.2 seconds, a couple of ticks quicker than the V6.

WSJ: 2013 Porsche Cayenne Diesel Review: Only Geeks Need Apply | Rumble Seat by Dan Neil