" closed universe" nghĩa là ...

Each body had already been identified and assigned a bar- coded toe tag by the Office of the Chief Medical Examiner of New York. This tragedy was a “closed universe” mass disaster, in their parlance, with a fixed and knowable number of casualties— the opposite of the collapse of the Twin Towers. Thanks to passport scans, passenger manifests, and the intact condition of the remains, identification of the decedents was a simple, straightforward task.