back face 请问哪位朋友 back face 与back cover

1.back face
后端面；背面
2.back cover
封底；表后背
例句：
1.Sunpower has moved all the wires and connectors to the back face.
太阳能源公司把这些电线和连线设备都移到电池背面去了.
2.On the back cover of the windmill is downloaded from the website down.
封底上的风车是从网站上下载下来的.