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单语范例（未经PONS编辑处理）
The main function of the snails was aesthetic, as they cleaned scum from the glass.
en.wikipedia.org They are, probably, the scum of the earth.
en.wikipedia.org The first tank builds up a layer of the hydrocarbon as well as other scum.
en.wikipedia.org Loathsome to such as are not acquainted with it, having a scum or froth that is very unpleasant taste.
en.wikipedia.org Waste water enters the first chamber of the tank, allowing solids to settle and scum to float.
en.wikipedia.org