2. 外语
  3. ____________(经常失眠)may be a sign of some psychological or physical problem.

____________(经常失眠)may be a sign of some psychological or physical problem.

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问题 ____________(经常失眠)may be a sign of some psychological or physical problem.
选项
答案Frequent sleeplessness
解析 sleeplessness解释为“失眠”。还可译为： Being unable to sleep frequently或A persistent insomnia等。
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大学英语四级

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