阶梯式倍投方案简介：As soon as Qin Fen approached the military camp, he was stopped by the guards at the door. One of the guards said: Please explain your identity and purpose of coming, otherwise you will be killed on the spot!
As soon as Qin Fen approached the military camp, he was stopped by the guards at the door. One of the guards said: Please explain your identity and purpose of coming, otherwise you will be killed on the spot!
