现在我们有了一张画布，让我们绘制一些标记来显示沿着标尺的不同点。

Now that we have a canvas, let's draw marks to show the various points along the ruler.

youdao

现在我们有了一张画布，让我们绘制一些标记来显示沿着标尺的不同点。

Now that we have a canvas, let's draw marks to show the various points along the ruler.

youdao