VACCINATING people against swine flu may be a lot easier than anyone dared hope, as it turns out that people have an unexpected degree of immunity to the pandemic now sweeping the world.
人们接种疫苗抵抗猪流感比任何人挑战希望容易得多，根据目前情况，人们对现在席卷全球的大流行有意想不到的一定程度的免疫性。
Seasonal H1N1 infection may have primed another part of the immune system, called cell-mediated immunity, which may not prevent infection but limits the severity of the disease .
季节H1N1感染可以活化另一部分免疫系统，称为细胞介导免疫性，它可以没有预先感染就能限制疾病的严重性。
The ancient marshy Nile would have hosted many eye disease-causing bacteria. Application of the makeup may have revved up cells' immunity and protected against infection.
湿软的古尼罗河想必滋生了不少导致眼部感染的细菌，而这些眼妆的应用则帮助古埃及人加速了免疫系统的工作，从而无眼病之虞。
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