The concept of a particle is only approximate and has meaning only in the limit of small momenta.
粒子的概念只是近似的,并且只有在动量较小的极限下才有意义。
可持续经济增长的关键在于全要素生产率的持续提升。
Music should take you to another place.
In a world of universal deceit, telling the truth is a revolutionary act.