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，现在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。更重要的是，它通过大信息量的数据交换促进人们之间的合作。人们已经进行了在互联网现场传输声音和图像的实验是什么意思？

The Internet was originally for the U.S. Department of Defense established an experimental network now covers more than 20 million computers worldwide, it is estimated that an increase of 500,000 units every year. It provides e-mail, thousands briefing press and a variety of database services. More

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The internet is at first an experimental network which establishes for the American Department of Defense, now 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 e

Internet is initially for the United States Department of Defense to establish an experimental network now covers more than 20 million computers worldwide, estimates also increased to 500,000 units a year. It provides e-mail, thousands of newsletter-News, as well as database services. More important

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