In the face of a blank piece of paper, the greatest happiness you feel is its blank space. You can have the greatest freedom to let you go. At the same time, blank space is also a kind of pressure, you must write something up, otherwise it will always be a piece of white paper. What's worse, if you don't write anything, wait until you want to write something, And your pen or paper breaks down. In the fight against nature, from the past to the present, people have been bullied. However, I have seen many small boats with smooth sailing and fast sailing. They have good weather. In addition, for those who are still working on the ground, I don't think they will encounter good weather or weather, but they don't know how to sail along the wind. What should we do? Can you take a look at the wind direction, repair and make up the boat to stay useful? This kind of decision is a creative decision, and can not find a unique optimal solution like dynamic planning. (The relativity of truth and historical limitations ). It seems that it is not easy to write something on paper.