当你已经选择了画笔工具，按下数字键可以调整画笔的不透明度。
When you have the brush tool selected, pressing the number keys will adjust the brush opacity.
该系统还能调整画笔的大小，橡皮的大小，颜色的选择。
The system can adjust the brush size, the rubber size, and the color options.
您可以调整草图的画笔大小，将滑块滑到左边缩小尺寸，滑到右边扩大尺寸。
You can adjust the brush size for your sketch by sliding the bar to the left for smaller size and to the right for larger size.
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