because there is a pattern to them.

因为它们已经形成了一种模式
These boys were thirteen years of age,

这些小男孩儿都是13岁
the highest age group--highest risk age group

而此类事件的
for something like this happening

高发群体年龄
is about thirteen years of age, males not females.

就是13岁左右男性不包括女性
The pattern in public health is called the epidemiology of these events.

在公共卫生领域这种模式叫事件流行病学
There's a pattern as to what are the high risk guns,

这个模式包括哪种是高风险的枪
what are the high risk times of day, times of the year.

一天或一年中什么时候是危险高发期
Because there's this pattern,

因为这些模式的存在
this epidemiology of these kinds of gun injuries and gun deaths,

这枪伤和枪击死亡的事件流行病学的存在
these gun injuries and gun deaths become,

这些枪伤或者枪击死亡变成了
to some extent, foreseeable.

从某种程度上讲可预见的