密着拓扑是有最小可能数的开集的拓扑，因为拓扑的定义只要求两个集合是开集。尽管它的简单性，带有多于一个元素和密着拓扑的空间 X 缺乏关键的想要的性质： 它不是T0 空间。
相对论则将时间、空间及重力看作光滑、不可分割的连续统一体。
Relativity treats time and space and gravity as a smooth, unbroken continuum.
草原文化的出现与草原民族的空间行为以及环境都有着密不可分的内在联系。
There has been a very close connection between the coming into being of the pastureland culture, the spatial behavior and the pastureland nationalities and the environment.
以临界土洞为界，岩溶塌陷的整个发育形成过程从时间和空间上划分为内部塌陷和地表塌陷两个密不可分的阶段。
In time and space, the whole process of karst collapse can be divided into two phases: inter collapse and surface collapse in term of the formation of the critical soil hole.
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