Operations Guide: mouse control, the left mouse button to select the point after point tools necessary to the position.
操作指南：鼠标控制，鼠标左键点要选择的工具后再点需要去的位置。
Operations Guide: mouse control, the left mouse button to select the point after point tools necessary to the position.
操作指南：鼠标控制，鼠标左键点要选择的工具后再点需要去的位置。
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