a piece of equipment in a plane used for recording details about a flight, especially to try to find out the cause of a problem or crash (飞机上记录详细飞行数据的)黑匣子
informala computer or similar piece of equipment that performs a complicated job, although the person using it does not understand how it works未知框(指使用者不知其运行原理却可以用其完成复杂任务的计算机或类似设备)