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The Money-Saving Dam Builders
To keep water in a river, people build walls. These walls are called dams. Dams can also keep water out of rivers.
人們建築水壩來控制河流的水位。水壩就像一道牆，把河水擋住。有時候水壩的功能是讓雨水不要進入河流。
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Published on 7 months, 3 weeks ago