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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 .<-FEMALE PROFESSOR:->Many experts believe that turtle excluder devices, also known as TEDs, are a very good way to protect endangered turtles, and that they should be a vital part of the equipment on any shrimp boat。
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2 .Here are their responses to the criticisms that you just read about.
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第3段
1 .First, it’s true that catching a turtle is a rare thing for any one boat.
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2 .However, there are, for example, thousands of shrimp boats operating off the southern coast of the United States.
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3 .Collectively these shrimpers accidentally catch thousands of turtles every year.
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4 .And these are endangered sea turtles whose populations are already too small, so harming several thousand every year is a big problem.
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5 .So when considering the impact of TEDs, don’t think in terms of an individual shrimper losing a few shrimp, but rather in terms of how the sea turtle population as a whole is affected by the shrimp industry as a whole.
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第4段
1 .Second, implementing time limits to ensure that the turtles are brought up for air in time—that sounds like a good idea, but only in theory.
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2 .The problem is that the time limits are almost impossible to enforce.
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3 .There’re thousands of shrimp boats far out at sea, and government patrol boats cannot really monitor the time limits all these boats use.
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4 .The use of TEDs is easier to enforce: all that’s required is checking the shrimp boats before they leave port and making sure their nets have TEDs.
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第5段
1 .Third, it’s true that TEDs can be too small for some very large species of turtle.
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2 .But in the areas where they’re needed, it’s not a problem to create TEDs that are somewhat larger.
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3 .The design of the TED can be modified easily without affecting the way that it functions.
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4 .So once larger TEDs begin to be produced, this will no longer be a problem.
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