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TOEFL IELTS BNC: 8303 COCA: 4173

C2 a substance containing a virus or bacterium in a form that is not harmful, given to a person or animal to prevent them from getting the disease that the virus or bacterium causes疫苗

This vaccine protects against some kinds of the bacteria.这种疫苗能抵抗这些细菌中的某几种。

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