对于超级英雄来说，这是他们与罪恶战斗的标志而且同时也是为了保护他的私人生活和家庭的匿名手段。
For superheroes, it serves as their symbol in fighting evil and sometimes provides them with the anonymity they need to protect their private lives and families.
科学家们研究了养宠物为何似乎能保护孩子不会患上哮喘与过敏，他们说，答案可能在于肠道内生活的菌群。
Scientists studying why pets appear to protect kids against asthma and allergies say the answer might lie in the world of bacteria that live in the gut.
科学家们研究了养宠物为何似乎能保护孩子不会患上哮喘与过敏，他们说，答案可能在于肠道内生活的菌群。
Scientists studying why pets appear to protect kids against asthma and allergies say the answer might lie in the world of bacteria that live in the gut.
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