求翻译：VSS/TSS主要反映了活性污泥中微生物含量的多少，由此可以再次证明磁粉对微生物的生长具有促进作用。是什么意思？

VSS/TSS mainly reflects the number of activated sludge microbial content in, which could once again prove that magnetic powder on the growth of microorganisms have a facilitating role.