spin-spin relaxation

例句：

1. 1.The spin-spin relaxation of thematerial is crucial for its mechanical properties.
   材料的自旋松弛对其机械性能至关重要。
2. 2. The spin-spin relaxation time is a keyparameter in determining the relaxation behavior of materials.
   自旋松弛时间是确定材料松弛行为的关键参数。
3. 3. In the study of spin-spin relaxation, it is important tounderstand the underlying mechanisms.
   在研究自旋松弛时，了解其背后的机制是很重要的。