The voices of the emergency telephone operators and the dispatchers from the fire department can be heard on the tapes, imploring those trapped inside the World Trade Center to be calm and sit tight.

• 从公布的磁带中可以听到紧急救援电话接线员和消防部门调度员的声音，他们要求被困在世贸大厦内的人保持冷静并待在原地。