生命是短暂的,所有动物和植物都会衰亡.大多数粒子的“寿命”则更为短暂,即使“长寿”的自由中子,其寿命不过十几分钟.中子衰变后产生三个较轻的粒子:质子、电子和反中微子(n°→p~++e~- +(?)_e);其他许多粒子的“寿命”只是一瞬间(10~(-22)～10~(-10)秒).那些似乎永恒的东西——山川、日月、银河等其实也总有消亡的那一天. Life is short and all animals and plants will die, and most particles will have a shorter “life span”, even for “long-lived” free neutrons, which last for ten minutes or less. Neutron decay produces three lighter Particle: proton, electron and anti-neutrino (n ° → p ~ ++ e ~ - + (?) _e); the life expectancy of many other particles is only an instant (10 ~ (-22) ~ 10 ~ 10) seconds) Those things that seem eternal - mountains, sun and moon, the Milky Way, etc. In fact, there is always the day the demise.