大小单双概率学简介：On a passenger ship that was about to depart, an old man with gray hair and a square scarf on his head and a cross-collared Confucian shirt was standing on the bow of the ship, saluting to the people seeing him off at the pier.
On a passenger ship that was about to depart, an old man with gray hair and a square scarf on his head and a cross-collared Confucian shirt was standing on the bow of the ship, saluting to the people seeing him off at the pier.
