例如，我们仍然很难让计算机系统地理解网上的大量自然语言文本。
And for example we're still very far away from having computers systematically understand large volumes of natural language text on the web.
对自然语言文本的理解，应该把它与一定的情境联系起来。
To understand a Text, we must relate the text with a specified situation.
与信息检索不同，信息抽取直接从自然语言文本中抽取事实信息。
Unlike information Retrieval, information Extraction Systems extract factual information directly from natural language texts.
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