For 50 minutes , he bounds across the stage , writing equations on the blackboard and rhapsodizing about the " amazing " and " beautiful " physics of rainbows .
50分钟内，他在讲台上蹦蹦跳跳，在黑板上写公式，狂热地赞美彩虹在物理上的“神奇”和“美丽”。
Perhaps we 'll sing hymns rhapsodizing our role as an ornate node in a vast network of new life that is spawning on top of the old .
