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，就像我们在感冒之后可以得免。

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

另组来自美国士兵信件是“取免力”个很好例子。

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

老死亡率低于预期可能是由于得性免所致。

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

如果你已经感染了之前种变异病毒，那么因感染得免力，是否能有效保护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.

有强有力证据表明，接触过之前几波西班牙流感可能会产生“得性免”，所以他们幸存了下来。