However, previous studies indicate that many digital libraries are still not effective for users.
然而，以往的研究表明，许多数字图书馆仍然不能有效地为用户服务。
Previous studies indicate that the volatility process of financial market has a distinctive long memory.
已有研究结果表明金融市场波动过程具有显著的长期记忆性。
CONTEXT: Previous studies indicate that the interpretation of trial results can be distorted by authors of published reports.
内容：之前的研究显示，实验结果的解释会受到作者已发表的报告的扭曲。
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