- The lack of fine fractions in the expanded clay necessitates the addition of other aggregates.
膨胀性粘土缺乏细料部分，故必须添加其它骨料。
- Commercial bentonite ores vary widely in amount and quality of the swelling clay, sodium montmorillonite.
商业用膨润土矿中的膨胀性粘土，钠蒙脱石在数量和质量上变化很大。
