Never stop learning because the world never stops changing.
永远不要停止学习,因为世界永远不会停止变化。
Every mathematical problem has a solution; you just need to find the right perspective.
Some of life,you have to go to great challenges.
债券市场是市场情绪的最终衡量标准。
真正的挑战不是种得更多,而是用更少的资源种得更好。