Mechanical method is to use wire brush or wrapped with wire cloth in the tube of the tube, and drag scale get rid.
机械方法是用铁丝刷或用铁丝裹上布条在管内来回拖动，把管内的水垢消除掉。
Drag the oval into the Brush Panel and choose New Art Brush.
拖动椭圆形成的画笔面板，并选择新的艺术画笔。
Clone this wall brush and drag it to its opposite end.
复制这面墙的固体并将其拖抓到另一端。
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