fill and draw basin 中间容器
fill and draw tank 间歇式沉淀池
fill and draw 间歇式
fill-and-draw contact bed 间歇式接触滤池
fill and draw contact bed 间歇式接触滤池
The fill() method closes any subpaths and then fills each subpath in turn using fillStyle (which can be a color, or, as discussed later, a gradient object) to determine how to draw the fill.
fill() 方法使所有子路径封闭起来，然后逐个填充每个子路径，期间使用 fillStyle （一种颜色，或一个渐变对象）来决定如何绘制填充。
Draw a rectangular shape and place it behind the shape. Set Fill to 0%. Add layer style Gradient Overlay.
画一个长方形，并将其背后的形状。设置塞0。加层风格梯度重叠。
Draw a rectangular selection and fill it with red on a layer above the background texture.
绘制一个矩形选区，填充红色背景纹理之上的一层。
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