练习材料：
Lesson 42-5 Recording an earthquake
it would be up anddown, to and fro and from side to side. Instruments have been devised and canbe so placed that all three elements can be recorded in different graphs.
When theinstrument is situated at more than 700 miles from the earthquake centre, thegraphic record shows three waves arriving one after the other at shortintervals. The first records the arrival of longitudinal vibrations. The secondmarks the arrival of transverse vibrations which travel more slowly and arriveseveral minutes after the first. These two have travelled through the earth. Itwas from the study of these that so much was learnt about the interior of theearth. The third, or main wave, is the slowest and has travelled round theearth through the surface rocks.
rɪˈkɔːdɪŋ ən ˈɜːθkweɪk
ɪt wʊd biː ʌp ænd
daʊn, tuː ænd frəʊ ænd frɒm saɪd tuː saɪd. ˈɪnstrəmənts hæv biːn dɪˈvaɪzd ænd
kæn biː səʊ pleɪst ðæt ɔːl θriː ˈɛlɪmənts kæn biː rɪˈkɔːdɪd ɪn ˈdɪfᵊrᵊnt ɡrɑːfs.
wɛn ði ˈɪnstrəmənt
ɪz ˈsɪʧueɪtɪd æt mɔː ðæn 700 maɪlz frɒm ði ˈɜːθkweɪk ˈsɛntə, ðə ˈɡræfɪk ˈrɛkɔːd ʃəʊz θriː weɪvz əˈraɪvɪŋ wʌn
ˈɑːftə ði ˈʌðər æt ʃɔːt ˈɪntəvᵊlz. ðə fɜːst
ˈrɛkɔːdz ði əˈraɪvᵊl ɒv ˌlɒŋɡɪˈʧuːdɪnᵊl vaɪˈbreɪʃᵊnz. ðə ˈsɛkənd mɑːks ði əˈraɪvᵊl ɒv ˈtrænzvɜːs vaɪˈbreɪʃᵊnz
wɪʧ ˈtrævᵊl mɔː ˈsləʊli ænd əˈraɪv ˈsɛvᵊrᵊl ˈmɪnɪts ˈɑːftə ðə fɜːst. ðiːz tuː hæv ˈtrævᵊld θruːði ɜːθ. ɪt wɒz frɒm ðə ˈstʌdi ɒv ðiːz ðæt səʊ mʌʧ wɒz lɜːnt əˈbaʊt ði ɪnˈtɪəriərɒv ði ɜːθ. ðə θɜːd, ɔː meɪn weɪv, ɪz ðə ˈsləʊɪst ænd hæz ˈtrævᵊld raʊnd ði ɜːθθruː ðə ˈsɜːfɪs rɒks.
任务配置：L0 + L4
知识笔记：
单词：1、graph：图形，图表，2、situate：位于，摆，3、graphic：形象的，图解的，4、longitudinal：纵，5、vibration：振动，震荡，波荡，6、transverse：横，7、interior：内部的，内地，内陆，8、
音标：
练习感悟：感觉还是很拗口的， 录了三四遍才达标。
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