?行星齿轮传动
... sun-and-planet gear ==> 行星齿轮,行星式齿轮 sun-and-planet gearing ==> 行星齿轮传动 sun-and-planet motion ==> 太阳-行星运动 ...
His addition of sun-and-planet gearing (1781) allowed engines for the first time to perform rotary motions--say, to drive a wheel.
FORBES: Magazine Article
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