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碎片内容
英文对照:My research focus is on what happens to our immune system as we age. So the job of the immune system is to fight infections. It also protects us from viruses and from autoimmune diseases. We know that as we get older, it's easier for us to get infections. So older adults have more chances of falling ill. This is evidence that our immune system really doesn't function so well when we age. In most of our work, when we were looking at older adults who've got an illness, we always have to have health controls.
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