In many cases, however, the soil must be stabilized by mixing some other material with it. This may be bitumen or a grout of concrete or some other substance.

• 但是在许多情况下，土壤中都要掺加其他材料使其稳定。这些材料或者是沥青，或者是一层水泥薄浆，还可能是某些其他的材料。