‌‌‌‌　　英：tous; 法：tore

‌‌‌‌　　圆环面是拉康在其拓扑学 (TOPOLOGY)研究中所分析的众多图形之一。在其最简化的形式中，它是一个圆环，是由一个圆柱体的两端接合起来而构成的一个三维对象 (图17)。

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‌‌‌‌　　拉康对于圆环面的最初提及可以追溯至1953年（见：E, 105), 但是直到他在1970年代开展关于拓扑学的工作，它才开始在其著作中凸显出来。圆环面的拓扑学阐明了主体结构的某些特征：

‌‌‌‌　　圆环面的一项重要特征在于它的重心是落在它的体积之外的，正如主体的重心是外在于其自身的：主体是去中心的，是离心的。

‌‌‌‌　　圆环面的另一项属性则在于“其周围的外缘与其中心的外缘仅仅构成了一个单一的区域”(E, 15)。这便阐明了精神分析如何问题化了“内在”与“外在”之间的区分（见：外心性[EXTIMITE])。

‌‌‌‌　　(tore) The torus is one of the figures that Lacan analyses in his study of TOPOLOGY. Inits simplest form, it is a ring, a three-dimensional object formed by taking a cylinder andjoining the two ends together (Figure 19).

‌‌‌‌　　Lacan's first reference to the torus dates from 1953 (see E, 105), but it is not until hiswork on topology in the 1970s that it begins to figure prominently in his work. Thetopology of the torus illustrates certain features of the structure of the subject:

‌‌‌‌　　One important feature of the torus is that its centre of gravity falls outside its volume, just as the centre of the subject is outside himself; he is decentred, ex-centric.

‌‌‌‌　　Another property of the torus is that 'its peripheral exteriority and its centralexteriority constitute only one single region' (E, 105). This illustrates the way thatpsychoanalysis problematises the distinction between inside'and 'outside' ((see EXTIMITE).