translation.en: It's this non-tracking collector with these six tuba-like horns, and each of them collect light in the following way -- if the sunlight strikes right here, it might bounce right to the center, the hot spot, directly, but if the sun is off-axis and comes from the side, it might hit two places and take two bounces.
translation.zh: 不需跟着太阳跑的，具有6个类似角状物的太阳能收集器， 每个角以以下方式收集太阳能-- 如果光线角度正好， 光线将直接反射到焦点， 但是如果光线偏离轴线，从侧边而来， 那么光线将照射角状物两次，即反射两次。