translation.en: Powering them is one of the greater engineering challenges that we had to deal with, because powering a cell phone under a tree canopy, any sort of solar power under a tree canopy, was an as-yet-unsolved problem, and that's this unique solar panel design that you see here, which in fact is built also from recycled byproducts of an industrial process.
translation.zh: 充电是我们必须应对的较大的 工程学挑战之一， 因为在树冠下给手机充电， 任何一种树冠以下的太阳能发电 都是一个尚未解决的难题。 这种独特的太阳能电池板设计， 你们现在看到的， 实际上也是通过回收一个工业过程中 的副产品建立起来的。