Standing at the edge of the smooth rolled sand you could look up in the empty stands and see old women sweeping out the boxes.

站在碾平的沙地边，你向上面空荡荡的看台望去，可以看见几个老婆子正在清扫包厢。

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Because the filters move with the plunger, the sweeping action of the fluid on the downstroke cleans the filters and keeps sand suspended within the production fluid.

因为滤渣器与泵塞是连轴一起移动的，在下冲程期间进入的液体可以起到冲刷作用，利用液体的冲刷来清理滤渣器，使砂粒悬浮于产出液中。

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By nightfall, the winds will pick up again, sweeping across the sand, erasing the footprints.

CNN: Romancing the dune in Namibia

The wild geography and topography around Killary, with its gorse-covered mountains, sweeping valleys and white sand beaches, presents both stark beauty and physical challenges.

BBC: A finish line few will cross