The Complete Works of China's Calligraphy contains Atao's Yuan Guan Tie, which says: "The word" An "at the end of the five elements (Yuan Guan Tie) is 10% more, which may be a mistake." Writing the word "female" under the word "Yao" is the same as the word "female" in the word "An" in Yuan Guan Tie, which is a backhand gesture of "strangulation" (one of the eight permanent characters) and is not wrong. The difference is that the word "female" in Yuan Huan Tie is big at first, then the second word merges inward, pauses a little, and then turns right after "le"; However, the first stroke of the word "female" in the engraving "Shu Tian High Speed Rail" is very small, almost straight. Accordingly, directly "le" and then turn left to press the pen.