neutral body

例句：

1. 1. Neutrons are a type of subatomic particle that can be found in the nucleus of atoms.
   中子是一种可以在原子核中找到的亚原子粒子。
2. 2. The study of neutrons has led to important discoveries about nuclear reactions.
   对中子的研究表明了关于核反应的重要发现。
3. 3. Neutrons have been used in medical imaging to help doctors diagnose diseases.
   中子被用于医学成像，帮助医生诊断疾病。