To free electrons, something has to make them whirl fast enough to break away from their nuclei.
为了释放电子，必须使电子高速旋转而足以摆脱它们的原子核。
2
Those new pieces include two new nuclei (byproducts), some photons (gamma rays), but also some more free neutrons, which is the key that makes nuclear fission a good candidate to generate energy.