Since density is mass divided by volume, the relative densities and relative sizes give the relative masses.

由于密度是质量除以体积，相对密度和相对大小给予相对群众。

youdao

Mass loss rates of fir leaf litter appeared consistent with the taxa and individual relative density of soil fauna.

不同孔径凋落物袋内土壤动物的类群和个体相对密度与凋落叶的质量损失率呈现相对一致的变化趋势。

youdao