4周搞定2000+托福核心词
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So later on in life, there are fewer and fewer of these naive T-cells left to deal with any new disease- causing organisms that might attack, which means less immunity, and the animal or person is more likely to get sick.
所以在生命的晚期，身体里剩下的能够处理任何新疾病的幼稚淋巴细胞会越来越少，导致器官遭受攻击，意味着免疫能力降低，而动物或人更容易生病。
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