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Populace definition is - the common people : masses.
【名詞】 [the populace; 集合的に] 大衆,民衆,庶民; (地域の)全住民 《☆【用法】 集合体と考える時には単数,構成要素を考える時には複数扱い》.
https://en.wikipedia.org/wiki/Recorder_(musical_instrument)
A flight recorder is an electronic recording device placed in an aircraft for the purpose of facilitating the investigation of aviation accidents and incidents. The device may often be referred to as a "black box", an outdated name which has become a misnomer—they are now required to be painted bright orange, to aid in their recovery after accidents.
There are two types of flight recording devices: the flight data recorder (FDR) preserves the recent history of the flight through the recording of dozens of parameters collected several times per second; the cockpit voice recorder (CVR) preserves the recent history of the sounds in the cockpit, including the conversation of the pilots. The two devices may be combined into a single unit. Together, the FDR and CVR objectively document the aircraft's flight history, which may assist in any later investigation.
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