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

三条线三个线轴出来绕成一条线，合三线并绕要求。

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.

当线路有或三条导线平行排列时，磁场会形成管状阱，原子可在其自由移动。