给定一篇英语文章，请计算其中单词的出现频率，并输出出现频率最高的前10个单词及其出现次数。
文章："Natural language processing (NLP) is a subfield of linguistics, computer science, and artificial intelligence concerned with the interactions between computers and human (natural) languages."
nlp: 1
natural: 2
language: 2
processing: 1
is: 1
a: 1
subfield: 1
of: 1
linguistics: 1
computer: 1
science: 1
and: 2
artificial: 1
intelligence: 1
concerned: 1
with: 1
the: 2
interactions: 1
between: 1
computers: 1
human: 1
languages: 1

出现频率最高的前10个单词及其出现次数：
natural: 2
language: 2
the: 2
nlp: 1
processing: 1
is: 1
a: 1
subfield: 1
of: 1
linguistics: 1