The expression of free energy is deduced by the method of cluster expansion.

利用“集团展开”方法，导出了系统的自由能；

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Based on the cylindrical cavity expansion theory, the squeeze stress induced by pile driving in soils around a pile and inside cluster of piles is analyzed.

本文根据圆柱孔扩张理论分析了在单桩周围和群桩内部土中产生的打桩挤压应力，并与室内模型试验和工程实录资料作了比较。

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In the period, if the expansion of the net, and tend to cluster vascular collects together, will show cavernous hemangioma and aneurysm.

在网状期，如果扩大的血管聚成团，并趋向融合在一起，就会表现出海绵状血管瘤和动脉瘤。

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