class, degree, grade, rank
这些名词均有“级，等级”之意。
class : 含义广泛，指人或物按优劣划分的等级，也指学校中的年级或班级。
As actress Jane is not in the same class as Susan.（作为演员, 简和苏姗不是同一层次。）
degree : 指程度、范围不同，社会地位的高低。也可指形容词或副词的级。
The workers show various degree of skill.（工人们表现出不同程度的技巧。）
grade : 指按地位或优劣划分的等级，既可指人又可指物。
The milk is sold in grades.（牛奶分等级出售。）
rank : 指人在社会中的地位或等级，尤指军队中的军衔。
The captain was promoted to the rank of major.（那上尉被提升为少校。）
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