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。
成功来自于努力、坚持和一点点运气的结合。
清晰的愿景是任何成功企业的基础。
The quality of your attention determines the quality of your life.
The desire to be loved is perhaps the most deeply rooted of all our vanity.
Always stay curious and open to new ideas.
所以天将要把重大任务落到这个人身上，一定先要使他的心志痛苦，使他的筋骨劳累，使他的身体饥饿，使他的身子穷困，并且使他的每一行为总是不能如意，借此来使他的内心震动，坚韧他的性情，增加他的才干。
The historian must have a kind of faith that humanity will not and cannot perish.