单词 | vaccine |
释义 | vaccinevaccine /vækˈsin/ ●○○ noun [countable, uncountable] medicine a substance which contains a weak or dead form of the bacterium or virus that causes a disease and is used to protect people from that disease: a hepatitis vaccine [Origin: 1700–1800 Latin vaccinus of a cow, from vacca cow; because the substance was originally obtained from sick cows] |
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