科学家们考虑过是放射性土壤导致的，或者是某种植物释放的毒素杀死了圆形植被造成的。
Scientists have suggested radioactive soil, or that toxins released from plants kills the vegetation in circular patterns.
全球越来越多的土壤侵蚀不仅导致了更多的土壤流失而且播散了致病微生物和各种毒素。
Increased soil erosion worldwide not only results in more soil being blown but spreading of disease microbes and various toxins.
环保局说，这是在清洗，纯化和废物处置阶段，干洗，这些有害毒素可以进入我们的空气，水和土壤中。
The EPA says that it is during the cleaning, purification, and waste disposal phases of dry cleaning that these hazardous toxins can get into our air, water, and soil.
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