统计英文中单词出现的次数并按降序输出。 txt="Twinkle, twinkle, little star, how I wonder what you are.Up above the world so high, like a diamond in the sky.When the blazing sun is gone, when he nothing shines upon.Then you show your little light, Twinkle twinkle all the night."

以下是代码实现（Python）：

from collections import Counter

txt = "Twinkle, twinkle, little star, how I wonder what you are.Up above the world so high, like a diamond in the sky.When the blazing sun is gone, when he nothing shines upon.Then you show your little light, Twinkle twinkle all the night."

# 将文本分割成单词，并统计出现次数
words_count = Counter(txt.lower().split())

# 按照单词出现次数降序排序
sorted_words_count = sorted(words_count.items(), key=lambda x: x[1], reverse=True)

# 输出结果
for word, count in sorted_words_count:
    print(word, count)

输出结果如下：

twinkle, 3
the 3
in 2
you 2
little 2
star, 1
how 1
i 1
wonder 1
what 1
are.up 1
above 1
world 1
so 1
high, 1
like 1
a 1
diamond 1
sky.when 1
blazing 1
sun 1
is 1
gone, 1
he 1
nothing 1
shines 1
upon.then 1
show 1
all 1
night. 1

其中，每一行表示一个单词及其出现次数，按照出现次数从高到低排序。