阶梯倍投方案胜进模式简介：Jianlu built a total of more than 300 rafts on the river bank, and put in 200 rafts in just one time. Each raft was one foot wide and could carry two to thirty soldiers.
Jianlu built a total of more than 300 rafts on the river bank, and put in 200 rafts in just one time. Each raft was one foot wide and could carry two to thirty soldiers.
