But let us end on an optimistic note, by happily taking long odds on medical breakthroughs: a vaccination against HIV; a cure for Parkinson's disease; even a cure for the common cold.

还是用一段乐观的旋律来结束这篇文章吧。医学上可能会有一些重大的突破：科学家可能研制出疫苗对抗hiv；或是找到治疗帕金森症的方法；甚至可能是治愈最普通的感冒的办法。

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