以往研究表明，老年痴呆症患者丧失认知能力的速度不同。
Past research has shown that cognitive function declines at different rates in Alzheimer's patients.
以往研究表明，BPR实施不当已成为ERP项目风险的重要来源。
Previous studies showed that improper implementation of BPR has become an important source of risk in ERP project.
大量以往研究表明，外语学习焦虑在多数情况下对外语学习起阻碍作用。
Many previous studies show that foreign language anxiety has negative effects on language learning in most cases.
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