To be absent-minded and distracted; to be in a daze or bewildered state.
考试前夕，他因为过度紧张而心绪恍惚，难以集中精力复习。
On the eve of the exam, he was so nervous that he became absent-minded and found it hard to concentrate on his revision.
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To be absent-minded and distracted; to be in a daze or bewildered state.