Semantic presupposition can be cancelled and, mostly, stand as a fixed proposition under the negation test, but some presuppositions fail to keep consistent under negation test.

在否定命题下，大多数预设仍保持为一个常值，但也有少数预设的否定命题不能够保持为一个常值。

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Test result shows that compared with traditional similarity model of word frequency, the weighted semantic similarity model improves the precision obviously.

实验表明，本文提出的基于语义树的加权语义相似度模型与传统的词频相似度模型相比，准确率有明显提高。

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The oral picture-naming task was still used for the semantic category test, which increased to 232 items, to deeply analyze the patients' naming ability in different semantic categories.

语义范畴测验仍沿用口语图形命名任务，但项目数扩增了许多(232个)，便于深入分析患者在不同语义范畴间的命名能力。

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