Ultraviolet B紫外线B Ultraviolet Radiation B紫外线B波段; 中波紫外线 Unterduck-Verdampfer-Brunnen (system used to treat contaminated groundwater)Unterduck-Verdampfer-Brunnen(系统用于治疗污染地下水) ultraviolet light,midrange sunbeam spectrum紫外线B光谱,中波紫外线光谱