It finds its theoretical origin mainly in Ludwig Wittgenstein's "play metaphor" and "family-similarity."

它的理论根据主要是维特根斯坦的“游戏原理”和“家族相似性”。

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Each of these eight kinds of exceptions has its own historical origin and legal expression and contains relatively deep theoretical meaning and practical value.

这八种例外，均各具有一定的历史渊源和法律表现，蕴含着较深的理论意义和实践价值。

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This paper introduces the origin of artificial shaking for enhancing oil recovery and its laboratory and theoretical achievements.

介绍了振动采油的起源，室内实验研究、理论研究、振源类型及现场试验成果。

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