名词
中文翻译：镇静剂
同义词：
['sleeping pill', 'hypnotic', 'tranquilizer']
例句：
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1. Shetook a sedative to help her sleep better.
她吃了安眠药以便更好地入睡。
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2. The doctor prescribed a sedative for her anxiety.
医生给她开了一种镇静剂来缓解她的焦虑。
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3.Sedatives are often used to treat insomnia.
镇静剂常用于治疗失眠症。