资料来源 : pyDict

定等级的人;平地机..年级生

资料来源 : Webster's Revised Unabridged Dictionary (1913)

Grader \Grad"er\, n.
   One who grades, or that by means of which grading is done or
   facilitated.

资料来源 : WordNet®

grader
     n : a judge who assigns grades to something