第三个假说是监督假说，这是他理论的核心。

The third hypothesis is the monitor hypothesis, which is central to his theory.

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从监督与输入假说来分析，对这个领域的研究者与老师来说，区分掌握和了解有直观的反映。

Both the Monitor Model, with its distinction between acquisition and learning, and the Input Hypothesis have intuitive appeal to researchers and teachers in the field.

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