The achievement of human knowledge and ability, like the processing method of bone like jade, needs careful consideration. Language is "poetry. Feng Wei. Qi Olympics. " Cutting, milling, cutting and grinding are the processing methods of bone, tooth, jade and stone respectively. A bone is cut, an elephant is handcuffed, a jade is cut, and a stone is ground. These four words are divided into parallel columns, which means that none of them can be done unless you add the power of learning and thinking. This is the power of learning. Another release, those who treat the tooth bone, should cut the tooth bone smooth. If you deal with jade, you must grind it to make it exquisite. This statement strives for perfection. Seek the old saying, say before. Both refer to good literary talent and cultivation.