Flu viruses, however, evolve so fast that this "immune memory" provides only partial protection.
然而，流感病毒进化如此之快，以致于这种“免疫记忆”只能提供部分保护。
The flu has battered down even the hardiest parts of the immune system.
这“流感”甚至已经破坏免疫系统最强大的部分了。
When people all around me have colds or the flu, I seem to be immune.
当身边的人感冒或者得了流感，我似乎是免疫的。
When people all around me have colds or the flu, I seem to be immune.
当身边的人感冒或者得了流感，我似乎是免疫的。
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