Make a rectangle with your fingers like this.
像这样用手指做个长方形的形状。
Make a rectangle with the rectangle Tool (any color) and Rasterize it.
使用矩形工具画一个长方形，填充任何颜色都可以。
Use the Rectangular Marquee Tool (m) to make a rectangle selection and fill it with white (3b).
使用矩形选框工具(m)建立选区如图(3b)并填充白色。
Select the Polygonal Lasso Tool (l), and then make a triangular selection around the bottom corner of the rectangle.
使用多边形套索工具(L)，然后在矩形上面做一个三角形的选区。
A line-box is an imaginary rectangle that contains all the inline boxes that make up a line in the containing block-level element.
line - box是一个假想的矩形框，包含在此块级包含元素内连成一线的所有inline box。
A line-box is an imaginary rectangle that contains all the inline boxes that make up a line in the containing block-level element.
line - box是一个假想的矩形框，包含在此块级包含元素内连成一线的所有inline box。
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