black box
noun [ C ] uk/ˌblæk ˈbɒks/ us/ˌblæk ˈbɑːks/
（飞机上的）黑匣子，飞行记录仪
a small machine that records information about an aircraft during its flight, used to discover the cause of an accident
Analysis of the black box recovered from the crash scene suggested pilot error was not the cause.
行车记录仪，汽车黑匣子
a piece of equipment placed in a car that records information about how well someone is driving
They equipped all school buses with a black box. 他们为所有的校车都配备了行车记录仪。