The trend is to observe the regular conclusions of financial trading market (stock, futures, foreign exchange, etc.) and is the main market tool - the three basic foundations of technical analysis: the market runs on trend. The origin of the trend concept is the stock market. It is generally believed that the stock price tends to the trend movement; Trading volume follows the trend; Once a trend is established, it tends to continue. Financial trading gurus tend to keep traders following trends. The more extreme Adam theory holds that markets have a high probability of moving in a particular direction for a period of time The commercial hotel period is the most active era in the world. It is the important stage of the development of the restaurant industry, which makes the restaurant industry eventually become the industry of the common people as the service object. It has not established the foundation of modern restaurant industry from all aspects. Zhou dynasty, in order to make it easy for the 71 kingdoms to meet the wangs and the imperial court, in the road of traffic, built a guest house for guests to stay. These stations or guest houses are the oldest residential facilities in Chinese history. The main purpose is to meet the basic survival needs of various official, commercial and diplomatic and military personnel - accommodation and accommodation. Scenes of torture and torture cannot be seen.