translation.en: We noticed that the unharmed cultures came from places of opposite contamination levels, so this mistake actually led us to think that perhaps we can compare the different degradative potentials of bacteria from sites of opposite contamination levels.
translation.zh: 我们注意到没有破损的培养基 来自于污染程度完全相反的两个地方， 这使我们想到 也许我们可以比较 污染程度相反地点所采集到的细菌