先前的钙钛矿型太阳能电池使用背面不透明的材料收集电流。
The perovskite solar cells made previously used an opaque material on the back to collect electrical current.
4保留下文件和你收到的书面信件，使用背面作为快速笔记薄或便条纸。
4keep documents and paper mail you receive and use the back side as quick note pads or scratch paper.
先前的钙钛矿型太阳能电池使用背面不透明的材料收集电流。
The researchers believe that perovskite-silicon cells will convert over 30 percent of the energy in sunlight into electricity.
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