bulk density的用法和樣例：
例句
- An amendment should decrease bulk density, increase total porosity, and increase water and air content.
改良劑能降低堆積密度，增加總孔隙度，增加水和空氣的含量。 - By this formula, the packing density of the different size distributions of slag and its water requirements were calculated and found to be the same with the testing results.
用該公式計算上述不同粒徑分佈的礦粉漿體的堆積密度及需水量，計算結果與試驗值基本吻合。
