Last Updated：2025/11/21
Sentence
捜査官は、古い干し草の山が自然発火、つまり外部の熱源なしに起こる燃焼のために焼失したと結論づけた。
Quizzes for review
The investigator concluded that the old haystack had burned due to spontaneous combustion.
See correct answer
The investigator concluded that the old haystack had burned due to spontaneous combustion.
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Related words
spontaneous combustion
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