“东道主”一词,源于《左传·僖公三十年》。本意是指东方道路上的主人。鲁僖公三十年(公元前630年),晋国与秦国联合围攻郑国。郑文公连忙派大夫烛之武去劝说秦穆公退兵。烛之武紧紧抓住秦晋虽然联合但仍然各怀私心的心理,运用假设推理,设身处地地为秦国着想,终于说服秦穆公退兵。烛之武对秦穆公说,秦国即使打败郑国,但中间 “Host ” term, from “Zuo Xi public thirty years.” Intentions refers to the owner of the East on the road. Thirty years Lu Lu (630 BC), Jin and Qin jointly siege of the Kingdom of. Zheng Wen Gong quickly sent a doctor to persuade Wu Mu Gong Wu military retreat. Candle Wu firmly grasp the Qin Jin though united but still cherish their own psychology, the use of hypothesized reasoning, put themselves in place for the sake of the Qin State, and finally persuade Qin Mu Gong retreat. Candle Wu Qin Mu Gong said that even if Qin defeated Zheng, but in the middle