这一制动齿轮有其机械方面的优势，利用它我可以用两只手指就可以轻松的举起横梁。并且，齿轮制动器还可防止重物落下。

The mechanical advantage of the gear differentials made raising my beams as easy as tugging on the chain with two fingers.

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例如，他必须要确定问题是否出在齿轮、制动器或车架上。

For instance, he must determine if the problem is with the gears, the brakes, or the frame.

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并且，齿轮制动器还可防止重物落下。

And the ratcheted brake prevented the load from slipping backward.

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