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。
Some people want it to happen, some wish it would happen, others make it happen.
Where reality (existence) is reasonable, all reasonable (presence) is realistic.
做企业要有长远的眼光,不能只看眼前利益。
所谓的理解,往往不过是误解的广泛流传。