Group 1 - The core point of the article highlights significant declines in the stock prices of several Chinese concept stocks, with notable drops in their trading volumes and market performance [1] Group 2 - Ming Teng International (MTEN) experienced a drastic decline of 43.15%, closing at 0.603 with a trading volume of 7.2959 million [1] - Su Xuan Tang (SXTC) saw a drop of 37.5%, closing at 1.250 with a trading volume of 416 million [1] - Brain Rejuvenation Technology (RGC) fell by 21.67%, closing at 41.420 with a trading volume of 166 million [1] - Pai Ming Chip City (IZM) decreased by 17.65%, closing at 2.100 with a trading volume of 56.11 million [1] - Star Map International (YIBO) dropped by 15.63%, closing at 0.8100 with a trading volume of 45.9 thousand [1]