peulrojiseuton
phlogiston
phlogistique
플로지스톤 이론은 18세기 화학에서 중요한 개념이었다.
peullojiseuton ilron-eun 18segi hwahak-eseo jungyohan gaenyeom-ieotda.
The phlogiston theory was an important concept in 18th-century chemistry.
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