The usage of metaphor is in connection with the fundamental change of speech in the semantic field, which can make people realize the literal meaning of the speech and also its figurative meaning.
比喻用法涉及言语在语义场的根本变化，使人既能意识到言语的字面的意义，又能意识到它的比喻意义。
To this end, the positive and negative transformations of propositional formulas are defined such that the semantic link between a literal and its negation is split.
为此，定义了命题公式的正变换和负变换，以便分离一个文字与其否定的语义联系。
However the literal meanings of text object and potential semantic relations could hardly be excavated.
文本对象词的字面关系和潜在语义关系很难被挖掘出来。
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