disproportionately

Johnson’s aversion to this tax was part of his reluctance to ask for any sacrifices for the Vietnam War -- except from the disproportionately blue-collar army that was fighting it.

约翰逊对这项税的反感，部分是因为除了浴血奋战的不成比例的蓝领军人外，他犹豫要不要要求其他人为越战做出一点点牺牲。