Last Updated：2025/11/21
Sentence
一部の国が生物兵器の使用を研究していたという証拠が明らかになった後、国際条約は強化された。
Quizzes for review
International treaties were strengthened after evidence emerged that some states had researched biological warfare.
See correct answer
International treaties were strengthened after evidence emerged that some states had researched biological warfare.
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