This paper states the general study of tree branching structure from the aspects of branch number, branching mode, branch angle and their space configuration status.
从枝条的分枝级数（数量）、分枝模式、分枝率、着枝角度及其空间配置状态等方面，论述了树木分枝结构的研究概况。
For a long time, Chinese coal-mining cities always adopt the development mode of "development and construction around mine", and resulting in more scattered city space structure.
长期以来，我国的煤矿城市大多采取“缘矿而建”的开发模式，由此形成较为分散的城市空间结构。
In order to calculate the equivalent step index of the periodic structure of the cladding holey optical fiber, all-vectorial fundamental space filling mode approach was utilized.
为了计算周期结构包层多孔光纤的等效阶跃折射率，采用了全矢量基本空间充填模式法。
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