给出一篇文章，其中包括若干个短语，编写一个程序用于计算每个短语在文章中出现的次数。
“I have a dream that one day this nation will rise up and live out the true meaning of its creed: 'We hold these truths to be self-evident; that all men are created equal.'”
下面是一个Python程序，可以计算特定短语在给定文章中的出现次数：

```
article = "I have a dream that one day this nation will rise up and live out the true meaning of its creed: 'We hold these truths to be self-evident; that all men are created equal.'"

phrases = ['I have a dream', 'this nation will rise up', 'true meaning', 'all men are created equal']

for phrase in phrases:
    count = article.count(phrase)
    print(f"The phrase '{phrase}' appears {count} times in the article.")
```

程序会输出以下结果：

```
The phrase 'I have a dream' appears 1 times in the article.
The phrase 'this nation will rise up' appears 1 times in the article.
The phrase 'true meaning' appears 1 times in the article.
The phrase 'all men are created equal' appears 1 times in the article.
```

如你所见，程序输出了每个短语在给定文章中的出现次数。