新概念入门第四册 40 PART A infinity, children, features, struggle

Rebecca949

Lesson 40 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, to rhythm, to life. (1)_______________________. These ocean waves are among the earth’s most complicated natural phenomena. The basic features include a crest ( the highest point of the wave), a trough (the lowest point), a height (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). (2)_______________________.

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毛圣ma

说的不错！

tracyzhao789

good

云南野菜uwc

我来了~~~嘿嘿~~

www.gu.cm

呵呵，看大家评论如何

杨飞飞儿

the wind then speeds messages of the sun to the sea, and sea transmits on through ways in .... powerful messages
although .. wave gives the impression of wild water moving in your direction. in actual activity ,waves move through the water leaving the water about what water was