Feynman propagator

例句：

1. 1.In quantum mechanics, the Feynman propagator is used to calculatethe probability of a particle's wavefunction decaying over time.
   在量子力学中，费曼传播子被用来计算粒子的波函数随时间衰减的概率。
2. 2.The Feynman propagator isa fundamental tool for understanding the behavior ofparticles in space-time.
   费曼传播子是理解空间-时间中粒子行为的基本工具。
3. 3. The Feynman propagator has been extensively studied in the contextof quantum field theory.
   费曼传播子在量子场论的背景下得到了广泛的研究。