Any valuable photo or paper-based document on display should be protected by a preservation-quality mat and frame.

展示的任何有价值的照片或纸质文件都应该保藏在能保证保存质量的垫子或框格里。

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Digital Photo frame has a problem. It need outside power. If it is made of solar charging, it will be nice. Put the frame on the sun for hours and it can display the picture for some time.

电子相框有一个麻烦就是需要接电源，如果把它做成太阳能充电的电子相框就好了，放在太阳下晒几个小时，就可不需要电源让电子相框显示一段时间的图片了。

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