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Từ điển Oxford Advanced Learner 8th 
	
		  lower classes   
  the ˌlower ˈclasses f120  [lower class lower classes] BrE NAmE   noun plural  (also the ˌlower ˈclass singular)  the groups of people who are considered to have the lowest social status and who have less money and/or power than other people in society    compare  ↑upper class    Derived Word: ↑lower class    See also: ↑lower class
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