closed manifold [数] 闭流形 ; 闭廖 ; 闭流型
three-dimensional closed manifold [数] 三维闭流形
closed linear manifold 闭线性廖 ; [数] 闭线性流形
closed combinatorial manifold [数] 闭组合流形
closed polyhedral manifold [数] 闭多面体流形
closed differentiable manifold [数] 闭微分流形
closed two-dimensional manifold [数] 闭二维流形
以上来源于: WordNet
As mathematicians say, “Every simply connected closed 3-manifold is homeomorphic to a 3-sphere.”
用数学语言表达就是“每个单连通3重（3-manifold）封闭体与一个三维球体同胚（homeomorphic）。”
Also, the paper discuss the existence of the infinite closed geodesics of a compact no-simply connected Riemannian manifold.
并由此讨论了紧致的非单连通黎曼流形上无穷多的闭测地线存在性问题。
As mathematicians say, "Every simply connected closed 3-manifold is homeomorphic to a 3-sphere."
用数学语言表达就是“每个单连通3重（3-manifold）封闭体与一个三维球体同胚（homeomorphic）。”
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