以下为句子列表：
英文: They observed the most common chemical reaction among a family of reactions on the DNA molecule that are linked to sunburn, and discovered that this key reaction happens with astounding speed -- in less than one picosecond, or one millionth of one million
中文: 他们观察到发生被晒伤的DNA分子上发生系列反应中最普遍的化学反应，并且发现这种反应速度惊人—至少以每皮秒或者每秒百万分之一的速度。
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