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What happened to Hong Kong stocks?

Today's trend of Hong Kong stocks should be unexpected. Yesterday's strong outbreak at the end of the day, the sharp rise of the Chinese stock market last night and this morning, and the strength of the mainland market today are always unable to find the reasons for diving. Seeing the interpretation of institutional experts, on the one hand, because of the interest rate meeting of the Federal Reserve, on the other hand, on the eve of Christmas, the market was depressed. Do it and cherish it!What happened to Hong Kong stocks?