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.
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.
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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