\nMost attempts at a so-called universal vaccine have the modest goal of inducing immunity against an entire family of virus — all coronaviruses or all flu viruses, for example — usually by mimicking evolutionarily conserved viral components that are less likely to mutate. A truly universal vaccine that can counter diverse pathogens was a pie-in-the-sky idea.
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实际情况究竟如何？首要变化体现在结构层面。2024年全国研招调查数据显示：重点高校学术型硕士（学硕）缩减招生或停止招生的现象日益普遍。众多专业削减了统招学硕名额，部分专业仅接收推荐免试或直接攻读博士的考生。
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Exploiting the deterministic hash for array index strings