练习材料
Lesson 30-3 Exploring the sea-floor
From the shore line, out to a distance which may be anywhere from a few miles to a few hundred miles, runs the gentle slope of the continental shelf, geologically part of the continents. The real dividing line between continents and oceans occurs at the foot a steeper slope.
This continental slope usually starts at a place somewhere near the 100-fathom mark and in the course of a few hundred miles reaches the true ocean floor at 2,500-3,500 fathoms. The slope averages about 1 in 30. but contains steep, probably vertical, cliffs, and gentle sediment-covered terraces, and near its lower reaches there is a long tailing-off which is almost certainly the result of material transported out to deep water after being eroded from the continental masses.
/ˈlɛsən/ 30-3 /ɪkˈsplɔrɪŋ/ /ðə/ /si/-/flɔr/
/frʌm/ /ðə/ /ʃɔr/ /laɪn/, /aʊt/ /tu/ /ə/ /ˈdɪstəns/ /wɪʧ/ /meɪ/ /bi/ /ˈɛniˌwɛr/ /frʌm/ /ə/ /fju/ /maɪlz/ /tu/ /ə/ /fju/ /ˈhʌndrəd/ /maɪlz/, /rʌnz/ /ðə/ /ˈʤɛntəl/ /sloʊp/ /ʌv/ /ðə/ /ˌkɑntəˈnɛntəl/ /ʃɛlf/, /ˌʤiəˈlɑʤɪkəli/ /pɑrt/ /ʌv/ /ðə/ /ˈkɑntənənts/. /ðə/ /riəl/ /dɪˈvaɪdɪŋ/ /laɪn/ /bɪˈtwin/ /ˈkɑntənənts/ /ænd/ /ˈoʊʃənz/ /əˈkɜrz/ /æt/ /ðə/ /fʊt/ /ə/ /ˈstipər/ /sloʊp/.
/ðɪs/ /ˌkɑntəˈnɛntəl/ /sloʊp/ /ˈjuʒəwəli/ /stɑrts/ /æt/ /ə/ /pleɪs/ /ˈsʌmˌwɛr/ /nɪr/ /ði/ 100-/ˈfæðəm/ /mɑrk/ /ænd/ /ɪn/ /ðə/ /kɔrs/ /ʌv/ /ə/ /fju/ /ˈhʌndrəd/ /maɪlz/ /ˈriʧəz/ /ðə/ /tru/ /ˈoʊʃən/ /flɔr/ /æt/ 2,500-3,500 /ˈfæðəmz/. /ðə/ /sloʊp/ /ˈævrɪʤɪz/ /əˈbaʊt/ 1 /ɪn/ 30. /bʌt/ /kənˈteɪnz/ /stip/, /ˈprɑbəbli/ /ˈvɜrtɪkəl/, /klɪfs/, /ænd/ /ˈʤɛntəl/ /ˈsɛdəmənt/-/ˈkʌvərd/ /ˈtɛrəsəz/, /ænd/ /nɪr/ /ɪts/ /ˈloʊər/ /ˈriʧəz/ /ðɛr/ /ɪz/ /ə/ /lɔŋ/ /ˈteɪlɪŋ/-/ɔf/ /wɪʧ/ /ɪz/ /ˈɔlˌmoʊst/ /ˈsɜrtənli/ /ðə/ /rɪˈzʌlt/ /ʌv/ /məˈtɪriəl/ /trænˈspɔrtəd/ /aʊt/ /tu/ /dip/ /ˈwɔtər/ /ˈæftər/ /ˈbiɪŋ/ /ɪˈroʊdəd/ /frʌm/ /ðə/ /ˌkɑntəˈnɛntəl/ /ˈmæsəz/.
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