Idiom is a kind of specific vocabulary formed in ancient China, most of which are four characters. There are also idioms composed of 3, 5, 7 or more words, but this type of words is relatively small. There is an allusion to its origin. Today, I'd like to introduce a idiom story to you. 1 In 73 ad, China was still in a feudal dynasty. At that time, the emperor ordered Dou Gu(name of a person), a senior official in charge of the expedition against Xiongnu(name of a country). Ban Chao(name of a person), 40, was was under the leadership of Dou Gu. In this expedition, ban Chao made great achievements in the war and was deeply appreciated by Dou Gu. Soon, Dou Gu ordered him and another senior general named Guo Xun(name of a person) to travel to the western region as diplomats. Ban Chao, with his 36 warriors, first came to Shanshan(Name of country). The king began to show great respect and courtesy to them, but within a few days he suddenly became indifferent. Ban Chao and his subordinates judged that this must be the emissary of the northern Xiongnu. The king's attitude was wavering and he was not sure which side to obey. So the Hu(Xiongnu nationality) people who received them were called in and cheated and said, "Hun emissaries have been here for a few days. Where is this moment?" The Nahu people were very frightened and admitted the actual situation, which proved that ban Chao's judgment was correct. Ban Chao confined the Hu people and…