添加锚点工具和删除锚点工具的作用很明显了，转换点工具允许你重新指定点的类型，以获得一个平滑的转角。

Add anchor point Tool and Delete anchor point Tool are fairly obvious and the Convert point Tool lets you to redefine the anchor points and give a smooth corner.

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默认情况下，钢笔工具会自动添加锚点到已存在的路径，删除已存在的锚点。

By default, the Pen tool (p) automatically adds anchor points to an existing path, and deletes existing anchor points.

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