grader

/ˈɡɹeɪdɚ/ 名词 C1

中文：平路机、分选机、某年级学生

A machine used in road maintenance, construction, and mining for leveling large surfaces.
A machine used to sort food by size or quality.
One who grades, or that by means of which grading is done or facilitated. · the graders of a school examination
One who belongs to a certain grade at school. · a first-grader

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