And look at the slope of the roof, the steep angle helps keep off all that rain and snow that accumulates in the winter.
看看屋顶的斜坡，陡峭的角度有助于阻挡所有在冬天积累的雨雪。
3
The key was bending the light the optimal amount, enough that it enters the solar panel at an angle, but not so much of an angle that the light reflects off and is lost.