Because - (affectionately) The earth is too boring and the universe is not easy to travel to. In order to save the world, to eliminate boredom, for our blood that has nowhere to put, for the sky to be dark every day, for the sky to light up again every day with great effort, for the sunflowers no longer Van Gogh, for the siege no longer Qian Zhongshu, for Calvino no longer winter nights, for Kafka no longer transform, for - then what can I drink water?