求翻译：在运行过程中，有磁粉反应器由于向上流体和重力的联合作用，污泥出现明显的分层现象。下层污泥絮体较大，排列紧实，如图2-5（a）所示，；中层污泥比较松散，颜色较浅，如图2-5（b）所示；上层污泥非常细小，沉降性能很差，絮体与液体没有明显的边界，很容易随水流出反应器，如图2-5（c）所示。对照组污泥在反应器中初始阶段出现明显的泥水分离现象，随着培养时间的增加，污泥絮体逐渐松散，变成浅黄褐色，沉降性能整体较差，经常出现跑泥现象，其污泥外观如图2-6所示。是什么意思？

Running process, the magnetic power reactor due up fluid and the combined effects of gravity, obvious stratification of sludge. Larger lower sludge flocs, arrange tightly, as in Figure 2-5 (a) below,; Middle sludge is relatively loose, lighter than the color, as in Figure 2-5 (b) below; upper sludge very small settlement to poor performance, aggregates and liquid there is no clear boundary easily with the water out of the reactor, shown in Figure 2-5 (c) below. Control group sludge slurry separation phenomenon occurs during the initial phase of reactor clearly, with the increase in training time, sludge flocs gradually loose, becoming pale yellow-brown, settlement overall poor performance, often running phenomenon of mud, its sludge appearance as shown in Figure 2-6.