translation.en: They could even be among us, any of us who got vaccinated, but the vaccine didn't produce the expected effect, because not all vaccines are always 100 percent effective.
translation.zh: 他们甚至可能就在我们身边 那些接种过疫苗 但没有产生预期的效果的人， 因为疫苗并不是百分之百有效的