练习材料：
Lesson40-1 Waves
Waves are the children of the struggle between ocean and atmosphere, the ongoing signatures of infinity. Rays from the sun excite and energize the atmosphere of the earth, awakening it to flow, to movement, torhythm, to life. The wind then speaks the message of the sun to the sea and the sea transmits it on through waves -- an ancient,exquisite, powerful message.
These ocean waves are among the earth's most complicated natural phenomena.The basic features include a crest(the highest point of the wave), atrough(the lowest point), aheight(the vertical distance from the trough to the crest), a wave length (the horizontal distance between two wave crests), and a period (which is the time it takes a wave crest to travel one wave length).
Although an ocean wave gives the impression of a wall of water moving in your direction, in actuality waves move through the water leaving the water about where it was.
应用配置：L0+L4
知识笔记：rhythm/ exquisite/ phenomena/ crest/ trough/ height/
练习感悟：用时52分。晚间补录。难读的词较多，用时较长。
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