将一组英文文本中的单词按照它们的词频进行排序
原文本为 "the quick brown fox jumps over the lazy dog jumps over the brown fox"
brown: 2 times
fox: 2 times
jumps: 2 times
over: 2 times
the: 3 times
lazy: 1 times
quick: 1 times

按照词频从高到低排序为：
the: 3 times
brown: 2 times
fox: 2 times
jumps: 2 times
over: 2 times
lazy: 1 times
quick: 1 times