They acquire immunity naturally just like our bodies acquire immunity when we get a cold.

它们通过自然途径得了免疫，就像我们在感冒以得免疫一样。

Another series of letters from an American private provides a good example of acquired immunity.

另一组来自美国士兵的信件是“取免疫力”的一个很好的例子。

A lower than expected mortality among the elderly may have been explained by acquired immunity.

老年人的死亡率低能是由得性免疫所致。

If you've been infected with one of the previous variants, how well does that immunity, that infection acquired immunity, protect you against this.

如果你已经感染了前的一种变异病毒，那么因感染得的免疫力，是否能有效保护人们免受奥密克戎感染呢？

There is strong evidence suggesting that exposure to previous waves of the Spanish flu could generate acquired immunity in those who had been infected, but had survived.

有强有力的证据表明，接触过前几波西班牙流感的人能会产生“得性免疫”，所以他们幸存了下来。