His history showed recent contact with sick chickens, which he kept as pets.
他的病史显示最近接触他作为宠物饲养的病鸡。
Children with pets at home have more robust immune systems and get sick less.
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.
家里养了宠物的小孩，免疫系统比较强，也少生病。
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