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[[ ]]の語と同じ意味で、要約に適したより高度な語を選びましょう。
Historians note that the authoritarian regimes of the twentieth century were quick to use the new mass media of radio and film, turning them into instruments of propaganda on an unprecedented scale.
Historians note that the authoritarian regimes of the twentieth century were quick to use the new mass media of radio and film, turning them into instruments of propaganda on an unprecedented scale.