blue-collar

形容词 blue-collar:

1. of or designating manual industrial work or workers
2. of those who work for wages especially manual or industrial laborers- G.B.Shaw
   同义词：propertyless, wage-earning, working-class

blue-col.lar

adj.（形容词）
Of or relating to wage earners, especially as a class, whose jobs are performed in work clothes and often involve manual labor.
蓝领工人的：属于或和工薪阶层有关的，尤指其工作要求穿着工作服和从事体力劳动的阶层

【引伸】
blue.-col.lar
n.（名词）