lucid
adjective uk/ˈluː.sɪd/ us/ˈluː.sɪd/
清晰的，明了的;（人）头脑清醒的，说话清楚的
clearly expressed and easy to understand, or (of a person) thinking or speaking clearly
She gave a clear and lucid account of her plans for the company's future. 她清楚明了地讲述了自己对公司未来的规划。
The drugs she's taking make her drowsy and confused, but there are times when she's quite lucid. 她吃的药会让她感到头晕、意识模糊，但有时头脑却很清醒。