Many of the largest US investment funds are being blocked from buying more shares in popular stocks due to diversification rules, as they struggle to keep up with indices that are increasingly dominated by a few massive tech groups.
基于分散投资规则，美国许多大型投资基金正被禁止购买更多热门股票，因为它们难以跟上日益由少数大型科技集团主导的指数。
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