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Its theoretical pillars are the theory of matter-element and the theory of extension set.
其理论支柱是物元理论和可拓集合。
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The extension set is one of the three mainstays of extension theory.
可拓集合是可拓论的三大支柱之一。
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The extension set is one of the three mainstays of extension theory.
可拓集合是可拓论的三大支柱之一。
youdao