magnetic concentration

例句：

1. 1.The magnetic field is responsible for the alignment of the molecules in the sample.
   磁场负责样品中分子的排列。
2. 2.The researcher used a magnet to concentrate the liquid.
   研究者用磁铁来集中液体。
3. 3.The magnetic field is crucial for the operation of many modern devices.
   磁场对于许多现代设备的运行至关重要。