Soon after the Pupin coil was introduced, it was discovered that, by crossing the wires of two circuits at regular intervals, another unexplainable circuit was induced.

普平线圈推出后不久，人们发现，将两个电路的导线每隔一定时间交叉，就会感应出另一个无法解释的电路。

The expression originally comes from horse races, where they would put a wire at the finish line (where the horses would end up), and whichever one crossed the wire first was the winner.

这个表达最初来自赛马，他们会在终点线（马匹最终到达的地方）放一根铁丝， 谁先越过铁丝就是赢家。