Under the control of the button, through the mouse to draw a line and round, easily.
在按钮的控制下，通过鼠标拖动来画直线和圆，轻松自如。
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A mouse has sharp teeth, round ears and a long tail.
一只老鼠有尖尖的牙，圆圆的耳朵和一条长长的尾巴。
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