The waiter in Chang 'an food stall is tired. The job of a food stall attendant needs to stand, walk and move things. And the work intensity is high, so it will be very hard and tired. When busy, waiters need to face high-intensity work pressure, and they need to process orders quickly, clean the table and serve guests. And they need to maintain a high degree of vigilance and physical exertion, so they are easily tired and feel tired.