英语语法分析

Postoperative recidivation and metastasis are common reasons lead to failure of treatment.

术后复发或转移是导致治疗失败的常见原因。

The drug combination features rapid curative effect, certain results and no toxic side effects, can prevent recidivation and can be taken for long term.

疗效迅速，效果确实，无毒副作用，可防止复发，是可较长期限服用的药物。