The typical BSF is 3 feet high.
（典型的净水器是3尺高）。
Jellison's group is conducting experiments on BSFs of various sizes, including systems that fit inside two - and five-gallon plastic pails. (The typical BSF is 3 feet high.)
杰利森的研究小组正在开展各种生物沙子饮用水过滤系统的研究，包括2 - 5加仑塑料设备系统(典型的生物沙子饮用水过滤系统是3英尺高)。
When the ratio of minority carriers'diffusion length to the substrate thickness is about 2.5 to 3, the crystalline silicon cells with an Al-BSF can gain the optimal output performance.
当少子扩散长度与衬底厚度的比值为2.5-3时，具有铝背场结构的单晶硅电池可获得最佳的输出特性。
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