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.
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。