OR NL能源与工程方面的助理实验室主管Dana Christensen说，煤电副产品的放射性引起的健康威胁很低。
Dana Christensen, associate lab director for energy and engineering at ORNL, says that health risks from radiation in coal by-products are low.
1983年生产出来的尼龙是由水、空气和煤的副产品合成的。
Nylon, a synthetic get from a combination of water, air, and a by-product of coal, was first introduced in 1983.
据报道，煤燃烧副产品排放量巨大而且增长十分迅猛。
It was reported that the amount of emission is rather large and increasing rapidly.
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