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hardbacks is hardback's Plural Form

hardback

US [ˈhɑrdˌbæk]
UK [ˈhɑː(r)dˌbæk]
  • na.硬书皮的书
  • Web精装本;精装书;硬封面的书
Plural Form:hardbacks  
na.
1.
精装书,硬书皮的书