ヒアリングの練習問題a-7999

0:25 ... and childbed fever meant that perfectly healthy moms were giving birth to perfectly healthy babies. but then the moms were (6 words) and nobody could figure out why. 産褥熱（さんじょくねつ）とは産後の母親に発症した恐ろしい感染症のことで、その原因は誰にもわからなかった。

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