So in the construction industry concrete is the stuff that results when you mix cement with filler material like sand or gravel.
因此在建筑业范围内，混凝土是水泥与沙或沙砾等填充物混合之后的产物。
There are traces of sand, mixed with crystals of gypsum. A typical mix picked up from walking the city of Boston.
地板上还有不少混合着石膏结晶的沙粒，这是在波士顿步行不可避免会带上的痕迹。
Sand should be screened before you mix it with concrete.
与混凝土混合前，沙子该筛一筛。
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