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密閉容器 (みっぺいようき) — airtight container
密閉容器
airtight container
秘密 ひみつ
secret; secrecy; confidentiality; privacy
閉鎖 へいさ
closing; closure
秘密兵器 ひみつへいき
secret weapon
密 みつ
dense; thick; crowded
三密 さんみつ
three Cs; three conditions that facilitate the transmission of infectious diseases (closed spaces, crowds, and close contact)