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At first, Mars was being seen as viable option to go visit and live in but now Scottish astrobiologists have discovered that the planet is covered with bacteria killing minerals.
起初，火星被视作可以访问并居住的星球，但现在苏格兰天体生物学家已经发现，火星上覆盖着致细菌死亡的矿物。
Jennifer Wadsworth and Charles Cockell published in a study that there are salt minerals that kill bacteria within minutes.
华兹沃斯和克基尔发表了一项研究，称火星上存在盐矿物，可以在几分钟内杀死细菌。
Usually these minerals are only active at high heat, and since the planet is cold, scientists at first thought they were not a problem,
通常这些矿物只在高温下活跃，因为火星是寒冷的，起初科学家认为是没有问题的，
But these new scientists have learned that they can also be activated with ultraviolet light, which Mars has plenty of.
但这些科学家已经认识到，它们也可以被紫外线激活，而火星上存在大量紫外线。
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