英语翻译"There are a number ofheroes in this.The people around the gunman stepped up," Assistant PoliceChief Paul McDonagh said Thursday."But for the great response by thepeople of Seattle Pacific,this incident might have been much moretragic."

英语翻译"There are a number ofheroes in this.The people around the gunman stepped up," Assistant PoliceChief Paul McDonagh said Thursday."But for the great response by thepeople of Seattle Pacific,this incident might have been much moretragic."
英语翻译
"There are a number of
heroes in this.The people around the gunman stepped up," Assistant Police
Chief Paul McDonagh said Thursday."But for the great response by the
people of Seattle Pacific,this incident might have been much more
tragic."

英语翻译"There are a number ofheroes in this.The people around the gunman stepped up," Assistant PoliceChief Paul McDonagh said Thursday."But for the great response by thepeople of Seattle Pacific,this incident might have been much moretragic."
如果不是 Seattle Pacific 的人们在事件中表现勇敢,这个事件很可能更为悲剧.
but for 是指 要不是
But for the doctor, I might have been dead.

“有很多
　　英雄在此。枪手加大了周围的人,”助理警察
　　首席保罗麦多纳周四说。“但对于伟大的反应
　　西雅图太平洋,这一事件可能是更多
　　悲剧。”

but for要不是...
这句话的意思是：要不是。西雅图太平洋大学人们的出色反应，这次事件可能会更加悲惨。

在这间事情中，诞生了很多的英雄人物，正是这些英雄人物阻止了歹徒的暴力活动，周四，某警官说到，要不是西雅图大学的这些英雄人物，当时的暴力事件，也许会更糟

最后一句的情态动词加完成时，是对过去的虚拟