复数
a book with cardboard or cloth or leather covers
同义词：hardback
having a hard back or cover
同义词：hardbacked??/??hardback??/??hardbound
Bookstores return about thirty-five per cent of the hardcovers they buy, and publishers write off the cost of producing those books.
NEWYORKER: Publish or Perish
Traditionally, publishers have sold books to stores, with the wholesale price for hardcovers set at fifty per cent of the cover price.
Enhanced e-books likely would be available for sale simultaneously with the hardcovers.
WSJ: Publisher in Talks With Apple Over Tablet
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