live vaccine

例句：

1. 1. The new vaccine isdesigned to protect against the most common strainsof influenza.
   新疫苗旨在预防流感最常见的几种毒株。
2. 2. The companyhas developed a live vaccine for poliothat can be administered without the need forinjections.
   该公司开发了一种用于脊髓灰质炎的活疫苗，无需注射即可使用。
3. 3. Livevaccines are typically given aspart of a series of shots,while inactivated vaccines are givenas a single dose.
   活疫苗通常作为一系列注射的一部分给予，而灭活疫苗则作为单剂给予。