关于双语脑有许多理论，主要包括共同表征理论和多重表征理论。两种理论各有证据支持。
The common representation theory and the multiple representation theory constitute two main theories, both of which have received empirical support.
尺度不变性可用分形和多重分形模型来表征。
Scale invariance can be described by means of fractal and multifractal models.
简要综述了重主族多重键，尤其是重主族累积多烯化合物的合成及结构表征和理论研究方面的最新进展。
This paper briefly summarized the new progress of theoretical studies on synthesize and characterize the compounds with multiple bonds between heavier main group elements, especially heavy cumulenes.
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