We have the Harvard-Yale football game every fall,

每年秋天我们有哈佛—耶鲁橄榄球赛，

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If this was tetanus, you got this tetanus vaccine when you were young; you get a boost every five or ten years because your antibody levels are starting to fall.

以破伤风为例,小时候,你接种过破伤风的疫苗,每隔五年或十年要再接种一次,这是因为体内的抗体浓度会下降

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