求翻译：（4）严格控制基层平整，面层铺筑前用3M 直尺对基层进行平整度检测，平整度差且大的路段应进行整平。面层摊铺前认真清扫基层表面，确保基层表面整洁，没有松散浮料和杂质。如有泥土应采用压力水冲洗干净，如基层表面局部下封层脱落，则应将脱落处基层表面清洗干净后补洒透层沥青或补做下封层， 面层铺筑前受到其他工序污染，如表面滴落水泥成硬渣时，应予及时清是什么意思？

(4) strict control of the grass-roots level, before paving the surface layer of grass-roots level with 3m straightedge flatness testing, poor flatness and large sections should be leveling. Carefully cleaning the surface layer of the substrate surface before paving, grass-roots level to ensure the s

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(4) strict control basic unit is smooth front, the surface layer lays carries on smoothness examination with the 3M straightedge to the basic unit, smoothness bad also the big road section should carry on the leveling.Front the surface layer spreads paving sweeps clear the basic unit surface earnest

(4) strict control of the grass-roots formation, surface paved with 3M before a ruler on the grass-roots for flatness detection, differential flatness and large sections should be leveling. Surface cleaning surface of grass-roots carefully before spreading to ensure grass-roots surface clean and tid