Let $\mathcal{S}=(V,f)$, be a symmetric submodular system. For two distinct elements s and l of V, let $\mathrm{\Gamma }(s,l)$ denote the set of all subsets of V which separate s from l. By using any Gomory-Hu tree of $\mathcal{S}$ we can obtain an element of $\mathrm{\Gamma }(s,l)$ which has minimum value among all the elements of $\mathrm{\Gamma }(s,l)$. This tree can be constructed iteratively by solving $|V|-1$ minimum $sl-$separator problem. Pendant pairs of a symmetric submodular system play a key role in finding a minimizer of this system. In this paper, we obtain a Gomory-Hu tree of a contraction of $\mathcal{S}$ with respect to some subsets of V only by using contraction in a Gomory-Hu tree of $\mathcal{S}$. Furthermore, we obtain some pendant pairs of $\mathcal{S}$ and of its contractions by using a Gomory-Hu tree of $\mathcal{S}$.

让 $\mathcal{小号}=（V，F）$，是对称的子模块化系统。对于两个不同的元件小号和升的V，让$\mathrm{\Gamma }（s，升）$表示将s与l分开的V的所有子集的集合。通过使用任何Gomory-Hu树$\mathcal{小号}$ 我们可以得到一个元素 $\mathrm{\Gamma }（s，升）$ 在以下所有元素中具有最小值 $\mathrm{\Gamma }（s，升）$。可以通过求解来迭代构造此树$|V|-\mathrm{1个}$ 最低 $s升-$分隔符问题。对称次模块系统的垂线对在寻找该系统的最小化器中起关键作用。在本文中，我们获得了收缩的Gomory-Hu树$\mathcal{小号}$关于V的某些子集，仅通过在$\mathcal{小号}$。此外，我们获得了一些吊坠对$\mathcal{小号}$ 和通过使用Gomory-Hu树的收缩 $\mathcal{小号}$。