| 单词 | sleepless |
| 释义 | sleepless —sleeplessly, adv. —sleeplessness, n. /sleep"lis/, adj. 1. without sleep: a sleepless night. 2. watchful; alert: sleepless devotion to duty. 3. always active: the sleepless ocean. [1375-1425; late ME; see SLEEP, -LESS] |
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