- (also flight recorder)
a small machine in a plane that records all the details of each flight and is useful for finding out the cause of an accident 黑匣子；黑盒；飞行记录仪 - [usually singular] (informal)
a complicated piece of equipment, usually electronic, that you know produces particular results, but that you do not completely understand 黑箱（常为电子的复杂仪器，内部结构不详）