求翻译：国际互联网最初是为美国国防部建立的一个实验性网络，涵盖了世界范围内的2000多万台计算机，估计每年还要增加50万台。它提供电子邮件、数以千计的简报式新闻以及各种数据库服务。是什么意思？

Internet was originally developed for U.S. Department of Defense to establish an experimental network, covering the world more than 20 million computers, an estimated increase of 50 million units every year. It provides e-mail, thousands of news presentation style and a variety of database services.

The Internet was initially established by the US Department of Defense as an experimental network, covering more than 2000 of the world-wide computer, it is estimated that each year 10,000 to 500,000 increase. It provides e-mail, a 1000 briefing by the type information as well as the various databas

The internet is at first an experimental network which establishes for the American Department of Defense, has covered in the worldwide scale more than 2000 ten thousand computers, estimated every year also must increase 500,000.It provides the email, thousands of bulletin type news as well as each

Internet is initially for the United States Department of Defense has established an experimental network, covering more than 20 million computers worldwide, estimated annual increase of 500,000 units. It provides e-mail, thousands of brief news, as well as database services.

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