把电离层和地面想象成电池的两极。 用一根导线连接这两极的话，电流就会流动，然后就会产生火花。
Think of the ionosphere and the ground as the terminals on the battery and you put a wire between those two terminals and current flows, and literally you get a spark.
殿内宽七间、深六间，极宽敞，却无一根柱子。
Inside the seven wide, deep six, very spacious, but no one pillar.
金属软管被处理成一根作大位移大回转运动的极细挠性梁。
This metallic hose is modeled as a super slender beam, with very large displacement and rotation.
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