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第1段
1 .<-NARRATOR:->Now listen to part of a lecture on the topic you just read about.
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第2段
1 .<-MALE PROFESSOR:->None of the solutions you’ve read about will effectively stop birds from getting injured.
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第3段
1 .First, replacing regular glass with one-way glass.
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2 .Well, the problem with one-way glass is that to the bird on the outside, a one-way glass surface reflects just like a mirror.
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3 .And a surface that reflects like a mirror is just as bad as regular glass for birds because birds don’t understand mirrors.
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4 .If they see a reflection of the sky in a mirror or of a tree in a mirror, they think the refection is the sky or is the tree, and they’ll fly right into them.
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第4段
1 .The second solution—painting colorful patterns like stripes on regular glass—also has problems.
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2 .As the reading said, these designs include openings so people inside the buildings can see out.
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3 .But birds will perceive these unpainted openings as open holes.
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4 .And if birds think that they’re seeing holes, they will try to fly right through them.
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5 .To prevent birds from doing this, the unpainted spaces in a window would have to be extremely small.
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6 .But that would then make the rooms of the buildings too dark for the people inside them.
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第5段
1 .The third solution, creating an artificial magnetic field, won’t work very well either.
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2 .While it’s true that birds use Earth’s magnetic field to help them navigate, they use this only when they’re traveling very long distances.
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3 .For example, if a bird is migrating from a cold country to a warm one before winter, it will use its magnetic sense to figure out which way it should fly.
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4 .But this ability isn’t used to go over short distances, such as going from one side of the city to another.
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5 .For short trips, birds use their eyes and the brightness of light to determine where to go.
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6 .So magnetic signals from buildings won’t have much effect.
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