The point of this exercise is not to practice your usage of the pencil or how to move your hand.
这个练习的精髓在于：不是在练习怎样用你手中的笔，或者怎样动你的手。
A pointer helps with control because instead of just using your eyes, you can physically move your hand to adjust your reading speed.
阅读时使用指针可以帮你很好地控制速度。
For example, when you touch the hot stove, not only does a message go out to move your hand but one also goes to another part of the brain to help you remember not to do that again.
比如当你碰到热火炉时，除了有信号传出让你挪开手外，还有信号会传向脑中另一区域让你记住这次教训。
Another common mistake is to lose pressure on the footholds at the moment when you move your hand, especially when the footholds are poor.
另外一个常犯的错误是在你移动手的时刻放松了脚点，特别是脚点很差的时候。
Another common mistake is to lose pressure on the footholds at the moment when you move your hand, especially when the footholds are poor.
另外一个常犯的错误是在你移动手的时刻放松了脚点，特别是脚点很差的时候。
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