Jellison. 'I liken it to returning to an old flame. Is it really a good idea?
杰利森说，这就像重回老情人身边，这真是个好主意吗？
“BSFs were developed in the 1980s, ” says Jellison. “This is the most comprehensive study to date to characterize the efficiency of different filter types.”
“八十年代开发了生物沙子饮用水过滤系统”， 杰利森说，“这是迄今为止全面研究不同效率的饮水系统的特点。”
"Smaller, lighter BSFs," says Jellison, an associate professor of civil and environmental engineering, "would be cheaper, easier to transport and available to a broader global market."
杰里森，一个城市和环境工程学的副教授说：“一个更小，更轻的净水器，而且必须要更加的便宜，更容易运输，可以被广大的市场所接受。”
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