在按钮的控制下，通过鼠标拖动来画直线和圆，轻松自如。
Under the control of the button, through the mouse to draw a line and round, easily.
鼠标控制三个按钮，左面的方向键控制按钮里的内容。
The mouse controls three buttons, the direction key control of the left side press button in of contents.
该系统用鼠标控制，按钮式操作，弹出式菜单选择，弹出窗口提示，全中文平台。
The system has advantages such as mouse control, push button operation, pop up menu selection, Windows prompt and all Chinese character desktop.
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