The primary purpose of keys, splines , and pins is to prevent relative rotary movement.

的钥匙，样条的主要目的，是为了防止引脚相对的旋转运动。

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How to make the unknown environment to be the relative structured environment is one of the keys in remote robotic welding in the non-structured environment.

对于具有非结构化特征的遥控焊接环境，如何将远端未知环境变成相对已知环境是遥控焊接任务实现的关键技术之一。

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However, if possible, I still prefer writing a letter to a friend or relative in ink instead of striking the keys on a keyboard.

然而，如果可能，我仍然愿意用墨水给亲朋写信而不是在键盘上敲字。

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