练习材料：
Lesson 7-2 Bats
Every solid objectwill reflect a sound, varying according to the size and nature of the object. Ashoal of fish will do this. So it is a comparatively simple step from locatingthe sea bottom to locating a shoal of fish. With experience, and with improvedapparatus, it is now possible not only to locate a shoal but to tell if it isherring, cod, or other well-known fish, by the pattern of its echo.
It has been foundthat certain bats emit squeaks and by receiving the echoes, they can locate andsteer clear of obstacles -- or locate flying insects on which they feed. Thisecho-location in bats is often compared with radar, the principle of which issimilar.
bæts
ˈɛvri ˈsɒlɪd ˈɒbʤɪktwɪl rɪˈflɛkt ə saʊnd, ˈveəriɪŋ əˈkɔːdɪŋ tuː ðə saɪz ænd ˈneɪʧər ɒv ði ˈɒbʤɪkt. əʃəʊl ɒv fɪʃ wɪl duː ðɪs. səʊ ɪt ɪz ə kəmˈpærətɪvli ˈsɪmpl stɛp frɒm ləʊˈkeɪtɪŋðə siː ˈbɒtəm tuː ləʊˈkeɪtɪŋ ə ʃəʊl ɒv fɪʃ. wɪð ɪksˈpɪərɪəns, ænd wɪð ɪmˈpruːvdˌæpəˈreɪtəs, ɪt ɪz naʊ ˈpɒsəbᵊl nɒt ˈəʊnli tuː ləʊˈkeɪt ə ʃəʊl bʌt tuː tɛl ɪf ɪtɪz ˈhɛrɪŋ, kɒd, ɔːr ˈʌðə wɛl-nəʊn fɪʃ, baɪ ðə ˈpætən ɒv ɪts ˈɛkəʊ.
ɪt hæz biːn faʊndðæt ˈsɜːtn bæts ɪˈmɪt skwiːks ænd baɪ rɪˈsiːvɪŋ ði ˈɛkəʊz, ðeɪ kæn ləʊˈkeɪt ændstɪə klɪər ɒv ˈɒbstəklz -- ɔː ləʊˈkeɪt ˈflaɪɪŋ ˈɪnsɛkts ɒn wɪʧ ðeɪ fiːd. ðɪs ˈɛkəʊ-ləʊˈkeɪʃᵊnɪn bæts ɪz ˈɒfᵊn kəmˈpeəd wɪð ˈreɪdə, ðə ˈprɪnsəpl ɒv wɪʧ ɪz ˈsɪmɪlə.
任务配置：L0 + L4
知识笔记：
单词：1、varying：不同的，易变的，2、shoal：浅滩，鱼群，浅的，3、comparatively：相对地，比较上，4、herring：鲱鱼，青鱼，5、cod：鳕鱼，6、squeak：吱，吱吱声，7、steer：驾驶，8、obstacle：障碍，障碍物，9、steer clear：避开，10、radar：雷达
音标：
练习感悟：今天的文章简短不拗口，读起来很不错，录了一遍就达标了。
网友评论