Charles Babbage is generally considered to have invented the first computer.这句话中的considered解释为什么?为什么用to have invented?

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• Charles Babbage is generally considered to have invented the first computer.的句子结构,to have invented是定语从句我知道,但结构真的判断不出来.
• Charles Babbage is generally considered to have invented the first computer.这句话中的considered解释为什么?为什么用to have invented?
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• Charles Babbage is generally considered to have invented the first computer.的句子结构,
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