红黑稳赢的公式方法

简介：Luo Xi and Chen Susu had just paid their tuition in the school cafeteria and were walking on the road to the library. The classmates around them were all wearing red and blue school uniforms, full of youthful atmosphere. They were chatting and holding hands. Holding hands, their faces were full of smiles, and they seemed to have endless whispers. ★