练习材料：
[Day 1748 2019-07-10]
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.
任务配置：L0+L1+L4
知识笔记：
plausible adj. 有道理的; 可信的; 巧言令色的; 花言巧语的;
hypothesis n. (有少量事实依据但未被证实的) 假说，假设; (凭空的) 猜想，猜测;
electroencephalograph n. 脑电描记器，脑电图机;
electrodes n. 电极;
scalp n. 头皮; (旧时美洲土著从被杀的敌人头上剥下作为战利品的) 带发头皮; (表示某人已被打败或已受到惩罚的) 标志;
psychiatrist n. 精神病学家; 精神科医生;
练习感悟：
