The concept of a particle is only an approximation, valid in the classical limit.
粒子的概念只是一个近似,在经典极限下有效。
不存在所谓的质量问题。
我们花了很多时间教领导者该做什么,却没有花足够的时间教他们该停止什么。
I have held many things in my hands, and I have lost them all; but whatever I have placed in God's hands, that I still possess.