练习材料
Lesson 42-1 Recording an earthquake
An earthquake comes like a thief in the night, without warning. It was necessary, therefore, to invent instruments that neither slumbered nor slept. Some devices were quite simple. One, for instance, consisted of rods of various lengths and thicknesses which would stand up end like ninepins. When a shock came, it shook the rigid table upon which these stood. If it were gentle, only the more unstable rods fell. If it were severe, they all fell. Thus the rods, by falling, and by the direction in which they fell, recorded for the slumbering scientist the strength of a shock that was too weak to waken him, and the direction from which it came.
/ˈlɛsən/ 42-1 /rəˈkɔrdɪŋ/ /ən/ /ˈɜrθˌkweɪk/
/ən/ /ˈɜrθˌkweɪk/ /kʌmz/ /laɪk/ /ə/ /θif/ /ɪn/ /ðə/ /naɪt/, /wɪˈθaʊt/ /ˈwɔrnɪŋ/. /ɪt/ /wəz/ /ˈnɛsəˌsɛri/, /ˈðɛrˌfɔr/, /tʊ/ /ɪnˈvɛnt/ /ˈɪnstrəmənts/ /ðət/ /ˈniðər/ /ˈslʌmbərd/ /nɔr/ /slɛpt/. /səm/ /dɪˈvaɪsəz/ /wər/ /kwaɪt/ /ˈsɪmpəl/. /wʌn/, /fər/ /ˈɪnstəns/, /kənˈsɪstəd/ /əv/ /rɑdz/ /əv/ /ˈvɛriəs/ /lɛŋkθs/ /ənd/ /ˈθɪknəsɪz/ /wɪʧ/ /wəd/ /stænd/ /ʌp/ /ɛnd/ /laɪk/ ninepins. /wɛn/ /ə/ /ʃɑk/ /keɪm/, /ɪt/ /ʃʊk/ /ðə/ /ˈrɪʤəd/ /ˈteɪbəl/ /əˈpɔn/ /wɪʧ/ /ðiz/ /stʊd/. /ɪf/ /ɪt/ /wər/ /ˈʤɛntəl/, /ˈoʊnli/ /ðə/ /mɔr/ /ənˈsteɪbəl/ /rɑdz/ /fɛl/. /ɪf/ /ɪt/ /wər/ /səˈvɪr/, /ðeɪ/ /ɔl/ /fɛl/. /ðʌs/ /ðə/ /rɑdz/, /baɪ/ /ˈfɑlɪŋ/, /ənd/ /baɪ/ /ðə/ /dəˈrɛkʃən/ /ɪn/ /wɪʧ/ /ðeɪ/ /fɛl/, /rəˈkɔrdəd/ /fər/ /ðə/ /ˈslʌmbərɪŋ/ /ˈsaɪəntɪst/ /ðə/ /strɛŋkθ/ /əv/ /ə/ /ʃɑk/ /ðət/ /wəz/ /tu/ /wik/ /tə/ /ˈweɪkən/ /hɪm/, /ənd/ /ðə/ /dəˈrɛkʃən/ /frəm/ /wɪʧ/ /ɪt/ /keɪm/.
