【趣谈英语】蝙蝠不瞎-Bats Aren’t Blind
时间：2016-02-14 05:47:32
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（单词翻译）
Pre-Listening Vocabulary
simile2: a figure of speech for comparing one thing to another, often with “like” or “as”
mammal: a warm-blood animal that nurses its young
misleading: causing someone to think something that is not true
echo: a sound that occurs due to a reflection of sound waves off an object
prey3: a living thing that is hunted and used for food
nocturnal: active at night; at rest during daylight
Bats Aren’t Blind
The expression “blind as a bat” is not an accurate simile. Studies suggest that bats rely on visual
landmarks4 just like birds do. Unlike birds, bats are mammals. The only mammal in the world that can fly is the bat. Some species of bats fly about rapidly when hunting for insects. This may be where the misleading expression comes from. It is true that bats don’t have strong night vision. Nocturnal bats rely on a sonar system called echolocation. They deliver a high-pitched call and wait for an echo. The echo tells the bats how far away they are from an object. This helps bats find their way around at night. It also helps them catch their prey. Not all bats are nocturnal, though. Large fruit bats don’t live in caves and actually like the daylight. Only a few of more than 1000 species of bats feed on blood.
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