家里养了宠物的小孩，免疫系统比较强，也少生病。
Children with pets at home have more robust immune systems and get sick less.
那是因为在生病时身体会建立抵抗和免疫系统。
That's because your body builds up its defenses and immune system by falling ill.
那是因为在生病时身体会建立抵抗和免疫系统。
That's because your body builds up its defenses and immune system by falling ill.
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