"uimnals"> Have you ever looked up at the night sky and wondered why the stars twinkle? In fact, the stars themselves do not actually twinkle--the illusion is caused by the numerous layers of atmosphere between us and them. 你是否曾抬头仰望夜空，思索着星星为什么会一闪一闪呢？事实上，星星本身并不能闪烁，感觉到星星在闪烁其实是一种幻觉，而这种幻觉是由于我们和星星之间的多层大气所造成的。 编辑推荐：名师指导公共英语阅读考试技巧 公共英语pets三级全真模拟试卷 公共英语pets二级语法讲解汇总