负盈利套利打法简介：After the tent was set up, Qin Fen took out the sleeping bags he had prepared and distributed them to everyone. Qin Fen himself had also prepared an extra-large sleeping bag, and after taking it out, he put it behind his tent.
After the tent was set up, Qin Fen took out the sleeping bags he had prepared and distributed them to everyone. Qin Fen himself had also prepared an extra-large sleeping bag, and after taking it out, he put it behind his tent.
