back cover例句

The assistant took the book and checked the price on the back cover.
店员拿起书，核对了一下封底的定价。

Back cover - map and address. address format to be same as name card.
封底 - 地图和地址. 地址格式相同名片.

And the screen need a back cover.
且屏体一般需要加后盖.