练习材料：
[Day 1749 2019-07-11]
Lesson 19-3 The stuff of dreams
He showed that the average individual's sleep cycle is punctuated with peculiar
bursts of eye-movements, some drifting and slow, others jerky and rapid. People woken
during these periods of eye-movements generally reported that they had been dreaming.
When woken at other times they reported no dreams. If one group of people were
disturbed from their eye-movement sleep for several nights on end, and another group
were disturbed for an equal period of time but when they were not exhibiting eye-movements, the first group began to show some personality disorders while the others
seemed more or less unaffected. The implications of all this were that it was not the
disturbance of sleep that mattered, but the disturbance of dreaming.
任务配置：L0+L1+L4
知识笔记：
bursts v. (使) 爆裂，胀开; 猛冲; 突然出现; 爆满; 涨满;
drifting v. 漂流; 漂移; 飘; 缓缓移动; 缓慢行走; 无意间发生; 无目的地转变; 顺其自然地做;
jerky adj. 忽动忽停的; 颠簸的; n. 干肉条; 熏肉条;
on end [词典] 竖着; 直立着; 连续地; 持续地;
exhibiting v. 展览; 展出; 表现，显示，显出(感情、品质或能力);
implications n. 可能的影响(或作用、结果); 含意; 暗指; (被) 牵连，牵涉;
练习感悟：
