So if we want to be able to understand, if we want to be able to find those traces of the signatures of life at the surface of Mars, if they are there, we need to understand what was the impact of each of these events on the preservation of its record.
所以如果我们想要了解， 如果我们想要在火星表面 找到那些生命印记的蛛丝马迹， 如果它们在那里的话， 我们需要了解这每一个事件 对于火星保存的记录有过怎样的影响。