练习材料
Lesson 42-3 Recording an earthquake
Why does a person standing in a bus or train tend to fall when a sudden start is made? It is because his feet move on , but his head stays still. A simple experiment will help us a little further. Tie a heavy weight at the end of a long piece of string. With the hand held high in the air,hold the string so that the weight nearly touches the ground. Now move the hand to and fro and around but not up and down. It will be found that the weight moves but slightly or not at all. Imagine a pen attached to the weight in such a way that its points rests upon a piece of paper on the floor. Imagine an earthquake shock shaking the floor, the paper, you and your hand. In the midst of all this movement, the weight and the pen would be still.
/ˈlɛsən/ 42-3 /rəˈkɔrdɪŋ/ /ən/ /ˈɜrθˌkweɪk/
/waɪ/ /dəz/ /ə/ /ˈpɜrsən/ /ˈstændɪŋ/ /ɪn/ /ə/ /bʌs/ /ɔr/ /treɪn/ /tɛnd/ /tə/ /fɔl/ /wɛn/ /ə/ /ˈsʌdən/ /stɑrt/ /əz/ /meɪd/? /ɪt/ /əz/ /bɪˈkəz/ /ɪz/ /fit/ /muv/ /ɑn/ , /bət/ /ɪz/ /hɛd/ /steɪz/ /stɪl/. /ə/ /ˈsɪmpəl/ /ɪkˈspɛrəmənt/ /wɪl/ /hɛlp/ /əs/ /ə/ /ˈlɪtəl/ /ˈfɜrðər/. /taɪ/ /ə/ /ˈhɛvi/ /weɪt/ /ət/ /ði/ /ɛnd/ /əv/ /ə/ /lɔŋ/ /pis/ /əv/ /strɪŋ/. /wɪð/ /ðə/ /hænd/ /hɛld/ /haɪ/ /ɪn/ /ði/ /ɛr/,/hoʊld/ /ðə/ /strɪŋ/ /soʊ/ /ðət/ /ðə/ /weɪt/ /ˈnɪrli/ /ˈtʌʧəz/ /ðə/ /graʊnd/. /naʊ/ /muv/ /ðə/ /hænd/ /tʊ/ /ənd/ /froʊ/ /ənd/ /əˈraʊnd/ /bət/ /nɑt/ /ʌp/ /ənd/ /daʊn/. /ɪt/ /wɪl/ /bi/ /faʊnd/ /ðət/ /ðə/ /weɪt/ /muvz/ /bət/ /ˈslaɪtli/ /ɔr/ /nɑt/ /ət/ /ɔl/. /ɪˈmæʤən/ /ə/ /pɛn/ /əˈtæʧt/ /tə/ /ðə/ /weɪt/ /ɪn/ /sʌʧ/ /ə/ /weɪ/ /ðət/ /ɪts/ /pɔɪnts/ /rɛsts/ /əˈpɔn/ /ə/ /pis/ /əv/ /ˈpeɪpər/ /ɑn/ /ðə/ /flɔr/. /ɪˈmæʤən/ /ən/ /ˈɜrθˌkweɪk/ /ʃɑk/ /ˈʃeɪkɪŋ/ /ðə/ /flɔr/, /ðə/ /ˈpeɪpər/, /jʊ/ /ənd/ /jər/ /hænd/. /ɪn/ /ðə/ /mɪdst/ /əv/ /ɔl/ /ðɪs/ /ˈmuvmənt/, /ðə/ /weɪt/ /ənd/ /ðə/ /pɛn/ /wəd/ /bi/ /stɪl/.
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