鹦鹉螺化石，这些螺旋状的贝壳，经常分布在二叠纪的化石群中。
Ammonoids, with their tightly coiled, spiral shells, are also widespread in the Permian fossil record.
螺旋桨采用升力面理论涡格法、吊舱采用面元法分析计算，二者的相互干扰通过叠代计算来处理。
The propeller blades are calculated by a vortex lattice method, while the pod including its strut by a boundary element method for non-lifting bodies.
以线圈耦合系数和电感分布电容模型为基础，设计优化了平面螺旋电感和叠层电感。
Based on the guidelines of the distributed capacitance mode and coupling coefficient formula, the stacked and planar inductors are designed.
以线圈耦合系数和电感分布电容模型为基础，设计优化了平面螺旋电感和叠层电感。
Based on the guidelines of the distributed capacitance mode and coupling coefficient formula, the stacked and planar inductors are designed.
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