科技股反弹难掩市场谨慎，欧股开盘涨跌不一，欧元小幅走高，投资者聚焦杰克逊霍尔会议

Group 1 - Global financial markets are in a cautious state, with investors awaiting key insights on interest rate paths from the upcoming Jackson Hole global central bank conference [1][2] - The Nasdaq 100 index has experienced a rebound due to bargain buying, which has also led to a mild increase in Asian tech stocks [1] - Despite the cautious sentiment, traders in the interest rate swap market are betting on a high likelihood of a Federal Reserve rate cut in September, highlighting a tension between market expectations and the central bank's decisions on inflation [2] Group 2 - Technology stocks, which have been the main drivers of the recent market rally, are currently struggling, with the Nasdaq 100 index declining for two consecutive trading days [3] - A measure of the so-called "seven giants" in tech has fallen for four consecutive days, marking the longest losing streak since mid-April [3] - Concerns about a potential bubble in U.S. stocks have been raised, with warnings that adjustments may not be imminent despite the current market conditions [3]