广播电视英语短句 第 314 课：运动量太少-2

Yet now comes a study showing an increase in the number of injuries in "phys ed" class. 现在还开展了一项调查，它显示了体育课中的受伤事件呈上升趋势。

Injuries increased one hundred fifty percent between nineteen ninety-seven and two thousand seven. 从 1997 年到 2007 年受伤率上升了 150% 。

The study involved injuries treated in hospital emergency departments. 这项调查涵盖了在医院急诊部处理的受伤事件。

Only two percent were serious. 这其中只有 2% 的是较为严重的。

The researchers did not try to identify the causes of the increase, but they have some theories. 研究者没有试图认证这一增长的原因，但是他们提出了一些理论。