统计英文儿歌《 twinkle twinklelittle star 》中,使用到的单词及其出现次数。要求去除单词大小写的影响,不统计标点符号的个数。在控制台中输出。 Twinkle, twinkle, littlestar, How I wonder what you are! Up above the world so high, Like a diamond in the sky. Twinkle, twinkle, little star, How I wonder what you are! When the blazing sun is gone, When he nothing shines upon, Then you show your little light, Twinkle, twinkle, all the night. Twinkle, twinkle, little star, How I wonder what you are! Then the travler in the dark Thanks you for your tiny spark; How could he see where to go, If you did not twinkle so? Twinkle, twinkle, little star, How I wonder what you are! In the dark blue sky you keep, and Through my curtains often peep, For you never shut your eyes, Till the morning sun does rise. Twinkle, twinkle, little star, How I wonder what you are! As your bright and tiny spark Lights the travler in the dark, Though I know not what you are, Twinkle on, please, little star. Twinkle, twinkle, little star, How I wonder what you are! 对英文儿歌出现的单词按照词频数从大到小进行降序排列,并在控制台输出。