自行车的链条会驱动后轮轮轴上的太阳齿轮，将动力传送到四周的行星齿轮。

The bike chain drives a sun gear on the rear axle, which transmits power to planetary gears situated around it.

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一种用于船舶动力装置或土方运输装置的行星齿轮箱，其包括空心齿轮1、两个或更多行星齿轮2以及太阳齿轮3。

A planetary gearbox for a Marine propulsion unit or an earth moving unit, comprises a hollow wheel gear 1, two or more planet gears 2, and a sun gear 3.

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最重要的两个部件，是齿轮箱(上图左侧)和太阳能电池(右侧)。

The two most important parts of this set are the gear box (shown above on the left) and the solar cell (shown on the right).

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