怎么判断长龙还是短龙简介：Although Bi Maokang has retired at home these years, he has never given up on the general trend of the world and his research on firearms. In addition to flintlock guns, another weapon he has been thinking about is rockets.
Although Bi Maokang has retired at home these years, he has never given up on the general trend of the world and his research on firearms. In addition to flintlock guns, another weapon he has been thinking about is rockets.
