| 摘要 |
<p>Froth is directed through a flow passage (170, 260, 300, 540) bounded by a filter (150, 270 530) and a non-porous surface (266, 512), and liquid is drawn from the froth through the filter (150, 270 530) as the froth flows through the flow passage (170, 260, 300, 540).</p> |
