quadrupole rod

例句：

1. 1. Thequadrupole rod is used toalign the beams of light in alaser system.
   四极杆棒用于在激光系统中对光束进行对准。
2. 2. The quadrupole rod was designed to improve thestability of the magnetic field.
   四极杆棒被设计用来提高磁场的稳定性。
3. 3. Thequadrupole rod is crucial for maintainingthe alignment of the laser beams.
   四极杆棒对于保持激光束的对准至关重要。