left-right needle

例句：

1. 1.The left-right needle is used to adjust the tension in the thread.
   左右针用于调整线中的张力。
2. 2. The left-right needle was designed for precise stitching.
   左右针是为精确缝纫设计的。
3. 3. The left-right needle is a common tool in sewing machines.
   左右针是缝纫机中常见的工具。