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你知道因特网是在什么时候建立的吗？
Do you know when the Intemet was first established?
youdao
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什么是主干网提供商？为什么它对因特网很重要？
What is a backbone provider and why is it important on the Internet?
youdao
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什么是主干网提供商？为什么它对因特网很重要？
What is a backbone provider and why is it important on the Internet?
youdao