frenquently

Vapor explosion of LPG happen frenquently during its storage and transportation, and the consequent damages are usually large.

液化石油气蒸气爆炸是其储运过程中较易发生且危害极大的一种热力过程。

Primary peritonitis(PP) is a serious complication of cirrhotic ascites, arising most frenquently in patients with advanced liver disease.

原发性腹膜炎是肝硬变腹水的严重并发症，多见于有严重肝病背景的病人。