Nevertheless, the study failed to indicate that Duluth residents had any greater amounts of asbestos in their tissues than residents of Houston, where the water is free of asbestos fibers.

• 不过，研究并没表明达拉奇居民比休斯顿居民体内含有更多的石棉细胞组织，在休斯顿，饮水并不受石棉纤维的影响。