bifilar secondary

例句：

1. 1. The cable is bifilar, so it's easy to connect different devices.
   这根电缆是双股的，所以很容易连接不同的设备。
2. 2.The tree has bifilar roots that spread out in all directions.
   这棵树有双股的根，向四面八方伸展。
3. 3. The bifilar structure of the skeleton allows for efficient movement and support.
   骨骼的双股结构使运动和支撑变得高效。