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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:-> It would be great if we could stop the lake's salt level from increasing and save its fish and birdpopulations, but the solutions you just read about aren't realistic or practical.

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第3段

1 .First-sure, taking salt out of the lake by desalination would reduce salinity, but it would present some serious problems as well.

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2 .For example, as you've read, water pumped into desalination facilities evaporates and leaves behind solid materials that were dissolved in the water.

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3 .Well, the solid materials that desalination facilities leave behind would pose a health risk.

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4 .The materials would be mostly salt, but they would also include other types of chemicals.

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5 .Some of the chemicals would be toxic, like selenium.

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6 .If the wind spreads selenium and other chemicals into the air, and people breathe them in, that would be very dangerous to people's health.

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第4段

1 .Second, the idea of bringing ocean water into the lake.

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2 .Again, this would reduce salinity, but, as you've read, it would require constructing pipelines or canals.

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3 .The problem is that the local government may not have enough resources to pay for such major construction.

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4 .The nearest shoreline of the Pacific Ocean is 100 kilometers away.

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5 .Pipelines or canals are very expensive to build over such long distances.

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第5段

1 .As for the third solution-dividing the lake into sections by building a system of walls-well, that's unlikely to work for very long.

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2 .That's because the Salton Sea is located in a region that experiences frequent and sometimes intense geological activity, like earthquakes.

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3 .That activity would almost certainly destroy the walls separating the different sections.

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4 .So while this solution might work for a short while, the walls would likely collapse the first time there's a major earthquake, and water from the special sections with high salinity will mix back in with the low-salinity water from the main section.

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