练习材料:
Lesson 7-2 Bats
Every solid object will reflect a sound, varying according to the size and nature of the object. A shoal of fish will do this. So it is a comparatively simple step from locating the sea bottom to locating a shoal of fish. With experience, and with improved apparatus, it is now possible not only to locate a shoal but to tell if it is herring, cod, or other well-known fish, by the pattern of its echo.
It has been found that certain bats emit squeaks and by receiving the echoes, they can locate and steer clear of obstacles-- or locate flying insects on which they feed. This echo-location in bats is often compared with radar, the principle of which is similar.
应用配置:L0+L4
知识笔记: shoal/shoal comparatively/kəmˈpɛrətɪvli pattern/pætərn emit/mɪt squeaks/skwiks obstacles/ɑbstəkəlz
练习感悟:用时43分。今日语感到后面才有感觉,最终的一版用时不到一分钟。








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