练习材料：
Lesson 14-1 The Butterfly Effect
Beyond two or three days, the world's best weather forecasts are speculative, and beyond six or seven they are worthless.
The Butterfly Effect is the reason. For small pieces of weather -- and to a global forecaster, small can mean thunderstorms and blizzards-- any prediction deteriorates rapidly. Errors and uncertainties multiply, cascading upward through a chain of turbulent features, from dust devils and squalls up to continent-size eddies that only satellites can see.
The modern weather models work with a grid of points of the order of sixty miles apart, and even so, some starting data has to be guessed, since ground stations and satellites cannot see everywhere. But suppose the earth could be covered with sensors spaced one foot apart, rising at one-foot intervals all the way to the top of the atmosphere.
应用配置：L0+L4
知识笔记： speculative/spɛkjələtɪv thunderstorms/θʌndərˌstɔrmzb lizzards/blɪzərdz deteriorates/dɪˈtɪriəˌreɪts multiply/mʌltəˌplaɪ turbulent/tɜrbjələnt satellites/sætəˌlaɪts
练习感悟：用时约1小时16分。生词太多，读起来困难。录制了几遍都不满意，重来。最后一遍还是有瑕疵。
