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.
基于分散投資規則，美國許多大型投資基金正被禁止購買更多熱門股票，因為它們難以跟上日益由少數大型科技集團主導的指數。
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