And the panels have to stay dust-free: just a seventh of an ounce of dust per square yard of panel can decrease solar power conversion by 40 percent.
偏偏太阳能板需要一个无尘的环境：每平方码只要有七分之一盎司的尘土就会降低太阳能板40%的转换效率。
2
Once the dust reaches a specified level, the system reacts and produces a charge, with electricity generated by the panel.
当粉尘达到一定量，系统将发生反应并产生一个电荷，太阳能板产生电流。
3
But such places often come with lots of dust. And the panels have to stay dust-free: just a seventh of an ounce of dust per square yard of panel can decrease solar power conversion by 40 percent.