在辊子下方设有刮土板，以消除附在辊子表面的黏土。
Scrapers are installed under the rolls for cleaning the roll surfaces.
表面上的小瑕疵只要刮平就可以轻易修复。再用一块塑料板把补土涂抹均匀。
Minor surface flaws are easily fixed with a skim of filler. Apply the filler smoothly with a plastic spreader.
实验表明：净风对土表的风蚀作用微弱，即使在遭到大风吹刮时，土表的结壳仍不易受到破坏。
The experiment indicates that wind itself is of weak effect on ground surface erosion, so that the soil crust may not be destroyed even under great wind velocity.
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