单词：attenuated vaccine
attenuated vaccine的用法和样例：
例句
- The Sabin oral antipolio vaccine and the BCG vaccine against tuberculosis are examples of this type of vaccine.萨宾口服脊髓灰质炎减毒疫苗以及抗结核卡介苗便是这类疫苗的例子。
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英语时差8，16
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