two-sphere model 双球模型
A two-dimensional model of such a universe would look like a sphere. It's impossible to have parallel geodesics (straight lines on a curved surface) — the two lines will cross at some point.
这样的2维宇宙模型就像是球体，不可能出现平行的测地线(测地线是曲面上的直线)——两直线必然在某点相交。
In this paper, we use two head models: ovoid head model and sphere head model.
本文采用两种脑模型：卵球脑模型和球脑模型。
The two-sphere model arises from some very simple observations of the stars which anyone can make.
这种双球面学说是根据任何人都能做到的对星星的简单观察而提出的。
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