利用三维粘性流动数学模型，研究了台阶突扩流动的三维特性。
The characteristics of the flow over a backward facing step are studied by use of a 3 D viscous flow mathematical model.
耀斑-激波传播的三维特性与太阳黑子活动区，日冕及冕洞的磁结构有密切关系。
Three-dimensional propagation properties of the flare-shock wave would bear close relations to the magnetic structure on the sun and the large scale structure in the interplanetary 'space.
进而将施工阶段管片衬砌的受力特性归纳为典型三维特性、不确定性及不可忽视性等三方面。
Afterwards, the influence of the construction loads on segments lining is discussed, including the cracks, partial breakage, sealing strip falling, segments leakage, and segments dislocation.
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