neutron

Definition

A subatomic particle found in the nucleus of an atom, with no electric charge and mass slightly greater than a proton. It plays a key role in nuclear reactions.

中文 原子核中的亚原子粒子，不带电荷，质量略大于质子，在核反应中起关键作用。

Example

"The release of neutrons during fission is what sustains a nuclear chain reaction."