练习材料
Lesson 30-2 Exploring the sea-floor
A burst of activity associated with the laying of submarine cables soon confirmed the challenger's observation that many parts of the ocean were two to three miles deep, and the existence of underwater features of considerable magnitude.
Today, enough soundings are available to enable a relief map of the Atlantic to be drawn and we know something of the great variety of the sea bed's topography. Since the sea covers the greater part of the earth's surface, it is quite reasonable to regard the sea floor as the basic form of the crust of the earth, with, superimposed upon, it the continents, together with the islands and other features of the oceans. The continents form rugged tablelands which stand nearly three miles above the floor of the open ocean.
/ˈlɛsən/ 30-2 /ɪkˈsplɔrɪŋ/ /ðə/ /si/-/flɔr/
/ə/ /bɜrst/ /ʌv/ /ækˈtɪvəti/ /əˈsoʊsiˌeɪtəd/ /wɪð/ /ðə/ /ˈleɪɪŋ/ /ʌv/ /ˈsʌbməˌrin/ /ˈkeɪbəlz/ /sun/ /kənˈfɜrmd/ /ðə/ /ˈʧælənʤərz/ /ˌɑbzərˈveɪʃən/ /ðæt/ /ˈmɛni/ /pɑrts/ /ʌv/ /ði/ /ˈoʊʃən/ /wɜr/ /tu/ /tu/ /θri/ /maɪlz/ /dip/, /ænd/ /ði/ /ɛgˈzɪstəns/ /ʌv/ /ˈʌndərˌwɔtər/ /ˈfiʧərz/ /ʌv/ /kənˈsɪdərəbəl/ /ˈmægnəˌtud/.
/təˈdeɪ/, /ɪˈnʌf/ /ˈsaʊndɪŋz/ /ɑr/ /əˈveɪləbəl/ /tu/ /ɛˈneɪbəl/ /ə/ /rɪˈlif/ /mæp/ /ʌv/ /ði/ /ətˈlæntɪk/ /tu/ /bi/ /drɔn/ /ænd/ /wi/ /noʊ/ /ˈsʌmθɪŋ/ /ʌv/ /ðə/ /greɪt/ /vəˈraɪəti/ /ʌv/ /ðə/ /si/ /bɛdz/ /təˈpɑgrəfi/. /sɪns/ /ðə/ /si/ /ˈkʌvərz/ /ðə/ /ˈgreɪtər/ /pɑrt/ /ʌv/ /ði/ /ɜrθs/ /ˈsɜrfəs/, /ɪt/ /ɪz/ /kwaɪt/ /ˈrizənəbəl/ /tu/ /rəˈgɑrd/ /ðə/ /si/ /flɔr/ /æz/ /ðə/ /ˈbeɪsɪk/ /fɔrm/ /ʌv/ /ðə/ /krʌst/ /ʌv/ /ði/ /ɜrθ/, /wɪð/, /ˌsupərəmˈpoʊzd/ /əˈpɑn/, /ɪt/ /ðə/ /ˈkɑntənənts/, /təˈgɛðər/ /wɪð/ /ði/ /ˈaɪləndz/ /ænd/ /ˈʌðər/ /ˈfiʧərz/ /ʌv/ /ði/ /ˈoʊʃənz/. /ðə/ /ˈkɑntənənts/ /fɔrm/ /ˈrʌgəd/ tablelands /wɪʧ/ /stænd/ /ˈnɪrli/ /θri/ /maɪlz/ /əˈbʌv/ /ðə/ /flɔr/ /ʌv/ /ði/ /ˈoʊpən/ /ˈoʊʃən/.
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