When the circuitry takes the form of two or three wires running in parallel, the magnetic field forms a tubelike trap along which the atoms can move freely.

当路中有二或导排列时，磁场会形成管状，原子可在其中自由移动。

The three wires were fed from the three spools and wound as one wire; thus comprising the trifilar terminology.

从个轴出来绕成一，从而符合并绕的要求。