three Cs; three conditions that facilitate the transmission of infectious diseases (closed spaces, crowds, and close contact)in ref. to 密閉, 密集, 密接see also 3密【さんみつ】
three Cs; three conditions that facilitate the transmission of infectious diseases (closed spaces, crowds, and close contact)in ref. to 密閉, 密集, 密接see also 3密【さんみつ】