英语语法分析

Psoriasis is a common recrudescent chronic inflammatory dermatosis.

银屑病是一种常见、易复发的慢性炎症性皮肤病。

Objective To discuss the causation and prevention of concretion recrudescent after cholelithiasis operation.

目的探讨胆石病术后结石复发的原因及防治。

Methods: 28 cases with recrudescent intra-spinal canal tumors were analyzed, and the causes of recrudescence were predicated.

方法：对28例椎管内复发肿瘤进行临床回顾性分析，并推断其复发因素。