If the universe's space-time is positively curved, like the surface of a sphere, parallel beams would come together.
如果宇宙的时空像球体表面一样正向弯曲，平行的光线就会交合在一起。
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。
The density profile of hard sphere fluid confined in two parallel hard walls was studied by using Rosenfeld density Functional Theory (DFT) and Molecular Dynamics (MD) simulation method.
利用密度泛函理论和分子动力学方法，对处于两平行硬墙之间的硬球流体的密度分布进行了计算。
In this paper the deformation and stress of a pneumatic membrane sphere under contact loading between two parallel planes are discussed.
本文讨论一充气的薄膜圆球在两平行平面间接触加载时的变形与应力问题。
In the present paper, we mainly study the codimension reduction problems for submanifolds with parallel unit mean curvature vector in a sphere.
本文将着重研究更为一般的具有平行单位平均曲率向量子流形的有关几何问题。
This paper suggests a sphere coordinate searching method which can be used to analyze the workspace of the 3 RPS parallel mechanism.
提出一种球坐标搜索法，对3- RPS并联机构进行了工作空间分析。
The issues relating to parallel importation are not only the problems in the sphere of intellectual property but also in the sphere of anti-unfair competition and international trade.
商标平行进口问题不仅仅是知识产权领域的问题，它还涉及到反不正当竞争和国际贸易方面的问题。
Moebius second fundamental form is important Moebills invariable on the unit sphere of submanifolds, in this paper, we classify the surface in s ~ 3 with semi-parallel Moebius second fundamental form.
Moebius第二基本形式是单位球面上子流形的重要的Moebius不变量，本文给出了S3中具有半平行Moebius第二基本形式的曲面的分类。
Moebius second fundamental form is important Moebills invariable on the unit sphere of submanifolds, in this paper, we classify the surface in s ~ 3 with semi-parallel Moebius second fundamental form.
Moebius第二基本形式是单位球面上子流形的重要的Moebius不变量，本文给出了S3中具有半平行Moebius第二基本形式的曲面的分类。
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