However, the relative incidence of cancers is changing with time.

然而，癌症的相对发病率是随时间而变化的。

Objective to sum up and analyze the implantation of permanent cardiac pacemaker so as to reduce the relative incidence of complications and raise the pacemaker's efficiency.

目的总结和分析永久心脏起搏器植入情况，旨在减少相关并发症，提高起搏器功效。

Background Relative to dislocations, glenohumeral subluxation events have received little attention in the literature, despite a high incidence in young athletes.

盂肱半脱位与移位相关，在年轻运动员中发病率高，但是在文献中并不常见。