And the mechanical or pneumatic mechanical gear changing was adopted.

过去一直采用的是手动机械式换档或气动机械式换档。

youdao

Multi gears is commonly used for the winch of oil RIGS each with different gear changing method.

石油钻机的绞车一般设计成多个档位，各档的挂合和变更方法都不同。

youdao

The combined benefits make this a more efficient method than the old one-by-one gear changing method.

各种各样的好处使得这种驾驶方法，比一个接一个换挡的老式方法，更加有效。

youdao

You can hear whether they're changing gear or slowing down.

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