倍投公式是多少

简介：Half a quarter of an hour later, the vast grassland outside the city suddenly started to rumble. It sounded like the sound of horse hooves, or the sound of many people stepping on the ground together, approaching from a distance, approaching the Great Wall. Gradually, the torches also lit up, getting brighter and brighter, and more and more, like fire dragons meandering, illuminating the grassland.