阶级 (jiē jí): ชั้น (สังคม)

In Marx's theory, society is divided into different classes, among which the bourgeoisie and the proletariat are the two most important.

With economic development, the class structure of this country has undergone significant changes, and the number of the middle class has increased substantially.

He was born into a poor family and felt the inequality caused by class differences from an early age.

In feudal society, class rigidification was very severe, and it was difficult for peasants to change their social status.