Lesson 38-3 Water and the traveler
Alcohol may be amedical disinfectant, but should not be relied upon to sterilize water. Ethanolis more effective at a concentration of 50-70 percent; below 20 per cent, itsbactericidal action is negligible. Spirits labelled 95 proof contain only about47 percent alcohol. Beware of methylated alcohol, which is very poisonous, andshould never be added to drinking water.
If no other safewater supply can be obtained, tap water that is too hot to touch can be left tocool and is generally safe to drink. Those planning a trip to remote areas, orintending to live in countries where drinking water is not readily available,should know about the various possible methods for making water safe.
ˈwɔːtər ænd ðə ˈtrævᵊlə
ˈælkəhɒl meɪ biː ə
ˈmɛdɪkᵊl ˌdɪsɪnˈfɛktᵊnt, bʌt ʃʊd nɒt biː rɪˈlaɪd əˈpɒn tuː ˈstɛrɪlaɪz ˈwɔːtə. ˈɛθənɒl
ɪz mɔːr ɪˈfɛktɪv æt ə ˌkɒnsənˈtreɪʃᵊn ɒv 50-70 pɜː sɛnt; bɪˈləʊ 20 pɜː sɛnt, ɪtsbækˌtɪərɪ'saɪdl ˈækʃᵊn ɪz ˈnɛɡlɪʤəbᵊl. ˈspɪrɪts ˈleɪbld 95 pruːf kənˈteɪn ˈəʊnli əˈbaʊt47 pɜː sɛnt ˈælkəhɒl. bɪˈweər ɒv methylated ˈælkəhɒl, wɪʧ ɪz ˈvɛri ˈpɔɪznəs,ænd ʃʊd ˈnɛvə biː ˈædɪd tuː ˈdrɪŋkɪŋ ˈwɔːtə.
ɪf nəʊ ˈʌðə seɪfˈwɔːtə səˈplaɪ kæn biː əbˈteɪnd, tæp ˈwɔːtə ðæt ɪz tuː hɒt tuː tʌʧ kæn biː lɛfttuː kuːl ænd ɪz ˈʤɛnərəli seɪf tuː drɪŋk. ðəʊz ˈplænɪŋ ə trɪp tuː rɪˈməʊt ˈeəriəz,ɔːr ɪnˈtɛndɪŋ tuː lɪv ɪn ˈkʌntriz weə ˈdrɪŋkɪŋ ˈwɔːtər ɪz nɒt ˈrɛdɪli əˈveɪləbᵊl,ʃʊd nəʊ əˈbaʊt ðə ˈveəriəs ˈpɒsəbᵊl ˈmɛθədz fɔː ˈmeɪkɪŋ ˈwɔːtə seɪf.
任务配置：L0 + L4
知识笔记：
单词：1、disinfectant：消毒剂，2、sterilize：消毒，杀菌，3、ethanol：乙醇，4、concentration：专注，浓度，浓缩，5、bactericidal：杀菌的，6、negligible：微不足道的，7、spirits labelled：烈酒，标有，8、proof：证明，证据，论证，凭证，9、methylated：甲基化的，10、readily：容易，爽快，乐意，11、available：可用的，可得到，12、relied upon：依靠，
音标：
练习感悟：这篇文章还是有点拗口的，不过还是录了两遍就达标了。
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