1 A real-time tradable index launched by FTSE Russell Index Co., Ltd. (now known as FTSE Russell Index), one of the four largest index companies in the world, to meet the needs of investors in China and qualified foreign institutional investors (QFII);

2.a50 refers to the 50 leading stocks with the largest market value in China A-share market. Futures index refers to all consecutive contracts in recent months (not the current month). Because the signing time is different, the price changes are also different. For convenience, it is observed in the form of "continuous contract".