【重点单词及短语】
retain v. 保持;记住
hold out 坚持;伸出;提供;维持
slumber v. 睡眠;麻木状态;静止状态 v. 睡眠;蛰伏;麻木
overt adj. 明显的;公然的;蓄意的
extract v. 提取;取出;摘录
integrate into 成为一体，融入;使……并入
navigate v. 驾驶，操纵;使通过
odd adj. 古怪的
take a nap 睡午觉;小睡一下
odds n. 几率;胜算
pilot study 初步研究;预备试验
toss sth. into 把……扔进
Question time:
1. What have scientists found between dreams and what we learn?
2. How do our brains act when we are at rest?