Fermi beta-decay theory

例句：

1. 1. The Fermi beta-decay theory has been a major area of research in nuclear physics for decades.
   费米β衰变理论是核物理领域几十年来的主要研究领域。
2. 2.The discovery of the neutrino, which is a particle that doesn't interact with matter or radiation, has challenged the Fermi beta-decay theory.
   发现中微子，这是一种不与物质或辐射发生相互作用的粒子，这挑战了费米β衰变理论。
3. 3. The Fermi beta-decay theory suggests that the universe began as a hot, dense ball of plasma and then cooled downthrough a process called beta decay.
   费米β衰变理论表明，宇宙最初是一个热、密集的等离子体球，然后通过一种称为β衰变的过程冷却下来。