Going deeper past that layer you've got the basement membrane and loose connective tissue, called the lamina propria—which together with the epithelium makes up the mucosa.

更深层由基底膜细胞和疏松结缔组织组成，被称为基底层，它和上皮层一起组成了气道的黏膜层。

A malignant tumor is composed of cells that invade the basement membrane and invade or spread to other parts of the body.

恶性 肿瘤是由该侵入基底膜并侵入或扩散到身体的其他部位的细胞。

Beneath the epithelium, there's another layer called the basement membrane made of tough connective tissue, and below that is the lamina propria which has yet more connective tissue that houses blood vessels, lymphatics, nerves, and immune cells.

在这层上皮下面的是另一层称为基底膜的结构，由坚硬的结缔组织构成，再往下是固有层，其包含更多结缔组织，容纳了血管、淋巴管、神经和免疫细胞。