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Everything was arranged, and Lü Bu and Li Su rode to the city gate to welcome the arrival of Zhang Yang, a martial arts officer. Zhang Yang was about twenty years old, with a kind face, a dark rosy mark on his cheeks, and strong limbs. He was much taller than the fifteen-year-old Lü Bu.

Zhang Yang had already felt a lot of emotion and respect for the scene he had seen before. Seeing that Lu Bu was indeed still a half-grown boy, he was even more impressed. So he stepped forward and explained that Ding Yuan, the governor of Bingzhou, had sent him to Jiuyuan to provide disaster relief. Lu Bu also expressed gratitude and concern to the court and the governor of Bingzhou on behalf of the elders and villagers of Jiuyuan.

The more than 200 soldiers who followed him also delivered ten carts of thousands of stones of food and fodder to Lu Bu's mansion.

The young men were all full of vigor and showed great enthusiasm for each other. Zhang Yang saw that the Red Hare, the horse that Lu Bu rode, was extremely majestic and the Fang Tian Hua Ji he carried with him seemed quite heavy. Zhang Yang, who was fond of martial arts, asked Lu Bu about the weight of the Fang Tian Hua Ji. When he learned that it weighed 180 catties (calculated at 288 catty and 115.2 ounces at that time, that is, catties), he could not help but be amazed at Lu Bu's strength. The weapon he used was also a heavier snake spear, but it weighed only catties (calculated at catty and ounces at that time, that is, catties).

Zhang Yang was a man of great martial arts and bravery, and was hired by Ding Yuan, the governor of Bingzhou, as a military advisor. He was eager to show off his skills, so he invited Lu Bu to fight in the training ground.

At this time, Lü Bu knew that the ancients valued filial piety. Fighting was just like playing cards, having fun, being pregnant during mourning, and singing operas for entertainment. Such behavior during the period of mourning would be ridiculed by the world. In order to gain a good reputation, he refused on the grounds that he was still in the mourning period for his parents and relatives. He also said that he had always lost to Li Su in fights with him earlier. For the time being, Li Su would fight with him in the parade grounds, and asked both sides to stop fighting at the right time to avoid hurting the harmony. After the 100-day mourning period, they would agree on another time to fight. The mourning period at this time was not as long as the three-year mourning period in later generations.

Li Su and Zhang Yang respected Lu Bu even more because of this, so they went to the training ground to compete on their own. It turned out that they were a perfect match, with equal strengths.

要知道，直到1959年6月25日新中国国务院发布《关于统一计量制度的命令》,才统一将1市斤=16市两改为十进制。原定十六两为一斤,因为折算麻烦,应当一律改为十两为一斤。

The hexadecimal system of jin and liang was first established after Qin Shihuang unified the six kingdoms. At that time, the prime minister Li Si was responsible for establishing the standards for weights and measures. Li Si successfully established standards for coins, length, etc., but he was at a loss as to weight. He really couldn't figure out how many liangs to set as one jin, so he asked Qin Shihuang for instructions. Qin Shihuang wrote a four-character instruction: "Fairness under heaven". After Qin Shihuang unified the country, the characters used simplified small seal characters, which was considered to be a standard for establishment, but the specific number was not specified. In order to avoid problems in the implementation in the future and be suspected and then take responsibility, Li Si decided to use the number of strokes of the four characters "fairness under heaven" as the standard, so he set one jin equal to sixteen liang. Unexpectedly, this standard of sixteen liang equal to one jin was used for more than two thousand years until 1959 after the founding of New China.