| 单词 | nocturnal sleep |
| 释义 | nocturnal sleepnocturnal sleepPhysiology Nighttime, or major, sleep period dictated by the circadian rhythm of sleep and wakefulness; the conventional time for sleeping |
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英语词典包含2567994条英英释义在线翻译词条，基本涵盖了全部常用单词的英英翻译及用法，是英语学习的有利工具。