bulkn.体积；容积；大块；大部分；大批adj.散装的；大量的vt.使膨胀；使成堆vi.膨胀；显得重要bulkrage[医] 大体积物质(增加肠内容, 从而促进蠕动的物质)

1. An amendment should decrease bulk density, increase total porosity, and increase water and air content.
   改良剂能降低堆积密度，增加总孔隙度，增加水和空气的含量。
2. 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.
   用该公式计算上述不同粒径分布的矿粉浆体的堆积密度及需水量，计算结果与试验值基本吻合。