Frankfurt am Main, Frankfurt-Am-Main, is the full name of Frankfurt, Germany. When you mention the riverside of the Main, you naturally think of Frankfurt; just as you mention the Huangpu River, you think of Shanghai and the Bund. Frankfurt's Main River, there are also skyscrapers and other modern civilization buildings, but unlike Shanghai, the Main River in Frankfurt has similar traces of early industrial civilization and imprints before industrial civilization. Frankfurt's chemical and financial industries are more famous, and it is more famous for the air transport hubs in Germany and even Europe. Frankfurt is a modern city, and on ordinary days, in the morning, I see people walking through the streets, mostly in a hurry, walking between buildings; it is difficult to see the gentleman's steps in London, the stroll of Paris, and the square dance in Shanghai. However, walking on the banks of the Main River, but not feeling the rapid rhythm of the metropolis, as if time suddenly lags. Yes, as if time and space are distorted, modern and ancient blending, bustling and desolate... We ride medieval grassland horses, hooves at the water; No, we ride Einstein's bicycles, and go at superlight speed, to retrieve Faust's contract to Mephiste, or let us pretend to be Goethe, eighty, and chase eighteen-year-old girls on the banks of the Main. And do not go back to the Middle Ages, or a certain century or a certain dynasty is no longer the dark, imprisoned, foolishness of the imagination. And life, the river is generally flowing, free. And breathe easily, no need to wear a mask to sing, no need to wear a mask to worship, fear.