The woman sounded middling young and lower middle class.听起来这位女士还算比较年轻，属中产阶级下层。Party activists with lower middle class pedigrees are numerous.党内积极分子中中产阶级下层出身的很多。He belongs to the lower middle class.他来自中产阶级下层。Members with lower middle class pedigrees are numerous.成员中中产阶级下层出身的很多。