Wang Guowei, a master of Chinese studies, used three words to describe the "three realms" of reading and learning in "Words on Earth".

Wang Guowei, a literary critic in the Qing Dynasty, took one sentence from each of the three Song ci poems in "Ci Hua on Earth" to express the three realms of doing things and learning. He said: "The great achievements of ancient and modern times are compared with three realms:' Last night, the west wind withered the green trees, and I went up to the tall building alone and looked all over the world'. This is also the first. I don't regret that my belt is getting wider, and I am haggard for Iraq. So is this second environment. Looking for him in the crowd, suddenly looking back, the man was there, and the lights were dim. This third condition is also "