There are two regrets in one's life. North cool doesn't smell snow, that is, North cool doesn't smell the sound of snow, doesn't hang, that is, has never been to the hanging mountain. It means sorry. This sentence comes from the warlord of the fantasy novel "Here comes the sword". One of them is "When the Great Wall of Shock Wave is about to be breached, it is said that many swordsmen will die there and have never been to the mountain". It's a pity that I didn't see the scene outside the Great Wall.