The dermis is rich in nerves.

真皮内有丰富的神经。

In this case, dermis.

这里指的是，真皮。

Fibers in the new dermis were thin.

真皮中新生胶原纤维细，含毛细血管。

We may say that the epidermis protects the dermis.

我们可以说是表皮保护了真皮。

We may say that the epi dermis proteets the dermis .

我们可以说是表皮保护了真皮。