foldback

例句：

1. 1. Thebook is folded back into its original shape.
   这本书被折叠回原形。
2. 2. She folded backthe curtains to let in more light.
   她把窗帘折回去让光线进来。
3. 3. Hefolded back the pages of the book andbegan reading.
   他翻开书页开始阅读。