Generally speaking, there are the following explanations:
—— Describe the superior geographical position and the dangerous terrain. Such as: "Xunzi Powerful Country": "It is dangerous and convenient, with beautiful mountains, rivers and valleys, and abundant natural materials, and it is also a victory."
-refers to a dangerous place. For example, "The History of the Ming Dynasty, Emperor Taizu Ji Yi": "The shape of the world is better than my control, and then I will enter the army."
-describe the magnificent mountains and rivers. For example, The Biography of Wei Shu Feng Liang: "Sejong gave him the strength to unite with Saman monks Siam and Yinzhenchen in Henan, and Zhou regarded Song as a high-profile winner, so he built a secluded Buddhist temple."
-describes the use of favorable situation to win. Sun Bin's Art of War, Qi Zheng, a bamboo slip from the tomb of the Han Dynasty in tapiscia sinensis, said: "Those who fight will win by appearance. Form can't win, but you don't know the shape that wins. The change of shape wins, and the world is not poor. "