1、The color of the sky is changing.first light gray to dark gray gradient.finally.finally become dark and dense.天空的颜色不断变化，先是浅灰色，渐变到深灰色，最后，终于变成乌沉沉、黑压压的了。2、Suddenly.the sky seems to boil.constantly jumping out Lightning flashes and thunder rumbles.countless extraordinary splendor.顿时，整个天空好像沸腾了一般，电闪雷鸣中不断的蹦现出无数的奇光异彩。