On the other side of the smooth muscle layer is the serosa.

在平滑肌层另一边是层。

From the outside in, these are the adventitia, or serosa; the muscular layer; the submucosa and the mucosa.

从看，分别是（或者说）、肌层、黏下层与黏。

The outermost layer is either the adventitia, a thick fibrous connective tissue, or the serosa, a slippery serous membrane.

化道，既有结缔组织构成纤维，也有光滑、分泌液。

Okay, so the intestinal wall, like this one, has lots of ridges and grooves, and also can be separated into the mucosal layer, submucosal layer, muscle layer, and serosa.

好，那肠壁有很多脊和槽，像这个图片一样，肠壁还可以被分成黏层、黏下层、肌层和层。

But of course it's much more than just a storage tank — it's lined with the same four main layers found through most of the GI tract — the mucosa, submucosa, muscularis externa, and serosa — but it's got a few special modifications.

当然，它不仅仅是一个储存罐。它衬着与大部分胃肠道相同四个主要层——粘、粘下层、肌层和——但它有一些特殊修改。