种类 kind; class; description; type; variety 不同种类的刀具 cutters of different kinds; 种类繁多 a great variety
等级 1.(按质量、程度、地位等的差异而作出的区别) grade; rank 薪金等级 pay grade; 牛奶是分等级出售的。 milk is sold in grades.2.(在社会地位和法律地位上不平等的社会集团) order and degree; social estate; social stratum 封建社会等级森严。 feudal society was rigidly stratified