主控结构面的形成和扩展是研究危岩发育机理的核心。
The formation and expanding of control fissure is the core of mechanism for perilous rock to develop.
基于BA生长网络的形成机理，提出产品市场和顾客选择的BA扩展模型。
Based on the development mechanism of BA growing networks, an extended BA model about product market and choice behavior of customers is proposed.
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