sigma-field prior to τ

例句：

1. 1. The sigma-field is a crucial componentof the quantum computing process.
   正电子场是量子计算过程的关键组成部分。
2. 2. Thesigma-field plays a significant rolein the formation of new materials.
   正电子场在新材料的形成中起着重要作用。
3. 3. Thestudy of the sigma-field hasled to many breakthroughs in medicaltechnology.
   对正电子场的研究已经导致了医学技术中的许多突破。