练习材料
Lesson 35-2 Space odyssey
Because the gravity on the Moon's surface is only a sixth of Earth's (remember how easily the Apollo astronauts bounded along), it takes much less energy to accelerate to that 1.5 miles per second than it does on Earth. Moon-dwellers will be able to fly in space at only three per cent of the cost of similar journeys by their terrestrial cousins.
Arthur C. Clark once suggested a revolutionary idea passes through three phases:
1 'It's impossible -- don't waste my time.'
2 'It's possible, but not worth doing.'
3 'I said it was a good idea all along.'
/ˈlɛsən/ 35-2 /speɪs/ /ˈɑdəsi/
/bɪˈkəz/ /ðə/ /ˈgrævəti/ /ɑn/ /ðə/ /munz/ /ˈsɜrfəs/ /ɪz/ /ˈoʊnli/ /ə/ /sɪksθ/ /əv/ /ɜrθs/ (/rɪˈmɛmbər/ /haʊ/ /ˈizəli/ /ði/ /əˈpɑloʊ/ /ˈæstrəˌnɔts/ /ˈbaʊndəd/ /əˈlɔŋ/), /ɪt/ /teɪks/ /mʌʧ/ /lɛs/ /ˈɛnərʤi/ /tʊ/ /ækˈsɛləˌreɪt/ /tə/ /ðæt/ 1.5 /maɪlz/ /pɜr/ /ˈsɛkənd/ /ðən/ /ɪt/ /dəz/ /ɑn/ /ɜrθ/. /mun/-/ˈdwɛlərz/ /wɪl/ /bi/ /ˈeɪbəl/ /tə/ /flaɪ/ /ɪn/ /speɪs/ /ət/ /ˈoʊnli/ /θri/ /pɜr/ /sɛnt/ /əv/ /ðə/ /kɑst/ /əv/ /ˈsɪmələr/ /ˈʤɜrniz/ /baɪ/ /ðɛr/ /təˈrɛstriəl/ /ˈkʌzənz/.
/ˈɑrθər/ /si/. /klɑrk/ /wʌns/ /səgˈʤɛstəd/ /ə/ /ˌrɛvəˈluʃəˌnɛri/ /aɪˈdiə/ /ˈpæsəz/ /θru/ /θri/ /ˈfeɪzəz/:
1 /ɪts/ /ɪmˈpɑsəbəl/ -- /doʊnt/ /weɪst/ /maɪ/ /taɪm/.'
2 /ɪts/ /ˈpɑsəbəl/, /bət/ /nɑt/ /wɜrθ/ /ˈduɪŋ/.'
3 /aɪ/ /sɛd/ /ɪt/ /wəz/ /ə/ /gʊd/ /aɪˈdiə/ /ɔl/ /əˈlɔŋ/.'
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