给定一个英文文章，请计算其中每个单词出现的次数，并按照出现次数从高到低的顺序进行排序。


"This is a sample text with several words. Some words are repeated, some are not."
is: 1

a: 1

sample: 1

text: 1

with: 1

several: 1

words: 2

Some: 1

are: 2

repeated: 1

not: 1


按照出现次数从高到低的排序: 

words: 2

are: 2

a: 1

is: 1

sample: 1

text: 1

with: 1

several: 1

Some: 1

repeated: 1

not: 1