frequency of injuries

例句：

1. 1.The frequency of earthquakes in this region is relatively high.
   这个地区的地震频率相对较高。
2. 2.The frequency of occurrence of this event is quite low.
   这种事件的发生频率相当低。
3. 3.The frequency of traffic accidents has decreased significantly since the implementation of the new regulations.
   自从实施新规定以来，交通事故的频率已经显著下降。