To be happy, I must have my books and a piece of sky.
            
            
        
        
    要快乐,我必须拥有我的书和一片天空。
        世界上最好和最美丽的东西是看不见甚至摸不到的——它们必须用心去感受。
                    The concept of NP-completeness has provided a powerful tool for understanding the complexity of problems.
                    数学是理性的音乐。
                    The path to success is paved with calculated risks and relentless effort.
                    I'm not a speech, I'm a melody.