练习材料
Lesson 30-1 Exploring the sea-floor
Our knowledge of the oceans a hundred years ago was confined to the two-dimensional shape of the sea surface and the hazards of navigation presented by the irregularities in depth of the shallow water close to the land. The open sea was deep and mysterious, and anyone who gave more than a passing thought to the bottom confines of the oceans probably assumed that the sea bad was flat. Sir James Clark Ross had obtained a sounding of over 2,400 fathoms in 1839, but it was not until of deep soundings was obtained in the Atlantic and the first samples were collected by dredging the bottom. Shortly after this the famous H. M. S. Challenger expedition established the study of the sea-floor as a subject worthy of the most qualified physicists and geologists.
/ˈlɛsən/ 30-1 /ɪkˈsplɔrɪŋ/ /ðə/ /si/-/flɔr/
/ˈaʊər/ /ˈnɑləʤ/ /ʌv/ /ði/ /ˈoʊʃənz/ /ə/ /ˈhʌndrəd/ /jɪrz/ /əˈgoʊ/ /wʌz/ /kənˈfaɪnd/ /tu/ /ðə/ /tu/-/dɪˈmɛnʃənəl/ /ʃeɪp/ /ʌv/ /ðə/ /si/ /ˈsɜrfəs/ /ænd/ /ðə/ /ˈhæzərdz/ /ʌv/ /ˈnævəˈgeɪʃən/ /priˈzɛntəd/ /baɪ/ /ði/ /ɪrɛgjəˈlɛrətiz/ /ɪn/ /dɛpθ/ /ʌv/ /ðə/ /ˈʃæloʊ/ /ˈwɔtər/ /kloʊs/ /tu/ /ðə/ /lænd/. /ði/ /ˈoʊpən/ /si/ /wʌz/ /dip/ /ænd/ /mɪsˈtɪriəs/, /ænd/ /ˈɛniˌwʌn/ /hu/ /geɪv/ /mɔr/ /ðæn/ /ə/ /ˈpæsɪŋ/ /θɔt/ /tu/ /ðə/ /ˈbɑtəm/ /ˈkɑnˌfaɪnz/ /ʌv/ /ði/ /ˈoʊʃənz/ /ˈprɑbəbli/ /əˈsumd/ /ðæt/ /ðə/ /si/ /bæd/ /wʌz/ /flæt/. /sɜr/ /ʤeɪmz/ /klɑrk/ /rɑs/ /hæd/ /əbˈteɪnd/ /ə/ /ˈsaʊndɪŋ/ /ʌv/ /ˈoʊvər/ 2,400 /ˈfæðəmz/ /ɪn/ 1839, /bʌt/ /ɪt/ /wʌz/ /nɑt/ /ənˈtɪl/ /ʌv/ /dip/ /ˈsaʊndɪŋz/ /wʌz/ /əbˈteɪnd/ /ɪn/ /ði/ /ətˈlæntɪk/ /ænd/ /ðə/ /fɜrst/ /ˈsæmpəlz/ /wɜr/ /kəˈlɛktəd/ /baɪ/ /ˈdrɛʤɪŋ/ /ðə/ /ˈbɑtəm/. /ˈʃɔrtli/ /ˈæftər/ /ðɪs/ /ðə/ /ˈfeɪməs/ /eɪʧ/. /ɛm/. /ɛs/. /ˈʧælənʤər/ /ˌɛkspəˈdɪʃən/ /ɪˈstæblɪʃt/ /ðə/ /ˈstʌdi/ /ʌv/ /ðə/ /si/-/flɔr/ /æz/ /ə/ /ˈsʌbʤɪkt/ /ˈwɜrði/ /ʌv/ /ðə/ /moʊst/ /ˈkwɑləˌfaɪd/ /ˈfɪzɪsɪsts/ /ænd/ /ʤiˈɑləʤɪsts/.
