【美股Alpha姐】2026.8.15一周美股复盘｜SPX 即将冲击 7900‑8000，高位要止盈吗？｜QQQ 牛旗突破，科技股还能继续冲高？｜流动性偏弱，当下该重仓还是做 T？
August 15, 2026
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