水是建造时间入口的屏障元素，该入口被用作在相切涡汇处的各个相切宇宙之间的门关。

Water is the barrier element for the construction of Time Portals used as gateways between Universes at the Tangent Vortex.

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螺旋桨表面和它的尾涡面离散为四边形双曲面元，每个面元上布置等强度偶极子和源汇分布。

The surface of propeller and its trailing vortex is divided into a number of small hyperboloidal quadrilateral panels with constant source sink and doublet distributions.

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压缩性的影响本文不采用P—G转换，而是直接使用可压缩空间后掠马蹄涡和源(汇)。

In this paper, the effect of compression does not be treated with PrandtI-Glauert's transformation, bat directly treated with compressible source (sink) and vortex.

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