新星

51 季节
992 插曲

新星 - Season 3 Episode 17 第 17 集 ()

As late as 1967, smallpox struck as many as 15 million people in 43 countries and killed an estimated two or three million. Experts now believe that the disease is on the verge of extinction. NOVA looks at the recent success of the World Health Organization's program to eradicate this disease, considered a triumph of western-styled medicine.


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55 分钟 2024 HD

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