I think prime numbers are like life. They are very logical but you could never work out the rules, even if you spent all your time thinking about them.

学习古人的文章，必须先理解其思想内涵，然后再学习其文辞表达。

创新是农业发展的核心动力，只有不断突破传统种植模式，才能让中国水果产业走向世界。