练习材料
Lesson 38-3 Water and the traveler
Alcohol may be a medical disinfectant, but should not be relied upon to sterilize water. Ethanol is more effective at a concentration of 50-70 per cent; below 20 per cent, its bactericidal action is negligible. Spirits labelled 95 proof contain only about 47 per cent alcohol. Beware of methylated alcohol, which is very poisonous, and should never be added to drinking water.
If no other safe water supply can be obtained, tap water that is too hot to touch can be left to cool and is generally safe to drink. Those planning a trip to remote areas, or intending to live in countries where drinking water is not readily available, should know about the various possible methods for making water safe.
/ˈlɛsən/ 38-3 /ˈwɔtər/ /ənd/ /ðə/ /ˈtrævələr/
/ˈælkəˌhɑl/ /meɪ/ /bi/ /ə/ /ˈmɛdəkəl/ /dɪsɪnˈfɛktənt/, /bət/ /ʃəd/ /nɑt/ /bi/ /rɪˈlaɪd/ /əˈpɔn/ /tə/ /ˈstɛrəˌlaɪz/ /ˈwɔtər/. /ˈɛθəˌnɔl/ /əz/ /mɔr/ /ɪˈfɛktɪv/ /ət/ /ə/ /ˌkɑnsənˈtreɪʃən/ /ʌv/ 50-70 /pɜr/ /sɛnt/; /bɪˈloʊ/ 20 /pɜr/ /sɛnt/, /ɪts/ bactericidal /ˈækʃən/ /əz/ /ˈnɛgləʤəbəl/. /ˈspɪrɪts/ /ˈleɪbəld/ 95 /pruf/ /kənˈteɪn/ /ˈoʊnli/ /əˈbaʊt/ 47 /pɜr/ /sɛnt/ /ˈælkəˌhɑl/. /bɪˈwɛr/ /əv/ methylated /ˈælkəˌhɑl/, /wɪʧ/ /ɪz/ /ˈvɛri/ /ˈpɔɪzənəs/, /ənd/ /ʃəd/ /ˈnɛvər/ /bi/ /ˈædəd/ /tə/ /ˈdrɪŋkɪŋ/ /ˈwɔtər/.
/ɪf/ /noʊ/ /ˈʌðər/ /seɪf/ /ˈwɔtər/ /səˈplaɪ/ /kən/ /bi/ /əbˈteɪnd/, /tæp/ /ˈwɔtər/ /ðət/ /əz/ /tu/ /hɑt/ /tə/ /tʌʧ/ /kən/ /bi/ /lɛft/ /tə/ /kul/ /ənd/ /əz/ /ˈʤɛnərəli/ /seɪf/ /tə/ /drɪŋk/. /ðoʊz/ /ˈplænɪŋ/ /ə/ /trɪp/ /tə/ /rɪˈmoʊt/ /ˈɛriəz/, /ɔr/ /ɪnˈtɛndɪŋ/ /tə/ /lɪv/ /ɪn/ /ˈkʌntriz/ /wɛr/ /ˈdrɪŋkɪŋ/ /ˈwɔtər/ /ɪz/ /nɑt/ /ˈrɛdəli/ /əˈveɪləbəl/, /ʃəd/ /noʊ/ /əˈbaʊt/ /ðə/ /ˈvɛriəs/ /ˈpɑsəbəl/ /ˈmɛθədz/ /fər/ /ˈmeɪkɪŋ/ /ˈwɔtər/ /seɪf/.
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