betain

例句：

1. 1. The beta particle is a subatomic particle that has the same mass as an electron but with a smaller charge.
   贝塔粒子是一种亚原子粒子，其质量与电子相同但电荷更小。
2. 2. The beta decay process involves the emission of a beta particle and the conversion of a nucleus into two or more neutrons.
   贝塔衰变过程涉及发射贝塔粒子和将一个核转变成两个或更多中子。
3. 3. In nuclear physics, beta decay refers to the process by which radioactive nuclei lose energy in theform of beta particles, leading to the formation of unstable nuclei.
   在核物理学中，贝塔衰变是指放射性核素通过释放能量的形式以贝塔粒子的形式失去能量，从而导致不稳定核的形成。