练习材料：

NCE--第四册

Lesson 40-2   Waves

If the water was moving with the wave, the ocean and everything on it would be racing in to the shore with obviously catastrophic results. An ocean wave passing through deep water causes a particle on the surface to move in a roughly circular orbit, drawing the particle first towards the advancing wave, then up into the wave, then forward with it and then -- as the wave leaves the particles behind -- back to its starting point again. From both maturity to death, a wave is subject to the same laws as any other 'living' thing. For a time it assumes a miraculous individuality that, in the end, is reabsorbed into the great ocean of life. The undulating waves of the open sea are generated by three natural causes: wind, earth movements or tremors, and the gravitational pull of the moon and the sun. Once waves have been generated, gravity is the force that drives them in a continual attempt to restore the ocean surface to a flat plain.

[ɪf] [ðə] [ˈwɔːtə] [wɒz] [ˈmuːvɪŋ] [wɪð] [ðə] [weɪv], [ði] [ˈəʊʃən] [ænd] [ˈɛvrɪθɪŋ] [ɒn] [ɪt] [wʊd] [biː] [ˈreɪsɪŋ] [ɪn] [tuː] [ðə] [ʃɔː] [wɪð] [ˈɒbvɪəsli] [ˌkætəˈstrɒfɪk] [rɪˈzʌlts]. [ən] [ˈəʊʃən] [weɪv] [ˈpɑːsɪŋ] [θruː] [diːp] [ˈwɔːtə] [ˈkɔːzɪz] [ə] [ˈpɑːtɪkl] [ɒn] [ðə] [ˈsɜːfɪs] [tuː] [muːv] [ɪn] [ə] [ˈrʌfli] [ˈsɜːkjʊlər] [ˈɔːbɪt], [ˈdrɔːɪŋ] [ðə] [ˈpɑːtɪkl] [fɜːst] [təˈwɔːdz] [ði] [ədˈvɑːnsɪŋ] [weɪv], [ðɛn] [ʌp] [ˈɪntuː] [ðə] [weɪv], [ðɛn] [ˈfɔːwəd] [wɪð] [ɪt] [ænd] [ðɛn] -- [æz] [ðə] [weɪv] [liːvz] [ðə] [ˈpɑːtɪklz] [bɪˈhaɪnd] -- [bæk] [tuː] [ɪts] [ˈstɑːtɪŋ] [pɔɪnt] [əˈgɛn]. [frɒm] [bəʊθ] [məˈtjʊərɪti] [tuː] [dɛθ], [ə] [weɪv] [ɪz] [ˈsʌbʤɪkt] [tuː] [ðə] [seɪm] [lɔːz] [æz] [ˈɛni] [ˈʌðə] [ˈlɪvɪŋ] [θɪŋ]. [fɔːr] [ə] [taɪm] [ɪt] [əˈsjuːmz] [ə] [mɪˈrækjʊləs] [ˌɪndɪˌvɪdjʊˈælɪti] [ðæt], [ɪn] [ði] [ɛnd], [ɪz] [ˌriːəbˈsɔːbd] [ˈɪntuː] [ðə] [greɪt] [ˈəʊʃən] [ɒv] [laɪf].

任务配置：

L0+L4

知识笔记 ：