Learning demands intelligence and sensitivity.

学习需要智慧和敏感。

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Machine learning is an important and difficult problem in artificial intelligence.

机器学习是人工智能的一个重要问题，也是一个难题。

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Machine learning is an important and difficult problem in artificial intelligence.

机器学习是人工智能的一个重要问题，也是一个难题。

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