练习材料：
Lesson 19-2 The stuff of dreams
If it is not a question of resting the body, then perhaps it is the brain that needs resting? This might be a plausible hypothesis were it not for two factors. First the electroencephalograph (which is simply a device for recording the electrical activity of the brain by attaching electrodes to the scalp) shows that while there is a change in the pattern of activity during sleep, there is no evidence that the total amount of activity is any less. The second factor is more interesting and more fundamental. Some years ago an American psychiatrist named William Dement published experiments dealing with the recording of eye-movements during sleep.
应用配置：L0+L4
知识笔记： plausible/plɔzəbəl hypothesis/haɪˈpɑθəsəs attaching/əˈtæʧɪŋ electrodes/ɪˈlɛktroʊdz psychiatrist/səˈkaɪətrəst
练习感悟：用时44分。中间有几个难度的单次卡壳，重复了几遍，最终完成。
