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.
联合国环境规划署警告说,除非有步骤地采取合理的材料收集和回收措施,否则后果将是灾难性的。
The consequences could be disastrous unless action is stepped up to properly collect and recycle materials, the agency warned.
收集材料的过程慢得让人难受。
And so he's able to bear a rich extensive body of materials to talk about Shakespeare with the students.
所以说他收集了丰富的广泛的,材料来与学生讨论莎士比亚。
Now, I've done my best to peg the readings to where I will be on that week's lecture, but I don't lecture with lecture notes, for the most part.
现在我已经尽力,为那周要做的讲座,收集很多阅读的材料,大部分时候我不按照讲稿来讲课。
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