On the morning of February 27th, during the midday trading break, China's A-share market witnessed a collective downturn across its three major indices. The Shanghai Composite Index slipped by 0.17%, the Shenzhen Component Index declined by 0.68%, and the ChiNext Index tumbled by 1.46%. In terms of sector performance, the AI computing power sector weakened, with the CPO (Co-Packaged Optics) and PCB (Printed Circuit Board) segments leading the downward trend. Specifically, Yoyolink saw its shares plummet by over 7%, Zhongji Innolight's stock dropped by more than 6%, and Victory Giant Technology's shares fell by over 5%. The glass fiber sector also experienced a significant decline, with Honghe Technology hitting the daily limit down (a term used in financial markets to describe a situation where a stock's price has fallen to the maximum allowed limit for that day), and Sinoma Science & Technology's shares declining by more than 8%. Conversely, the rare earth sector emerged as a bright spot, with China Rare Earth Color reaching the daily limit up (indicating the stock's price has risen to the maximum allowed limit for that day, here the pinyin "limit up" is retained for precision as per original text, but understood in financial context as a significant price increase), and Xiamen Tungsten's shares surging by over 8%. Notably, the Huawei-related concept stocks strengthened, with Topwise Information hitting the daily limit up, and Digital China's shares rising by more than 6%.