单词：ground water dynamics
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Lesson 16: [00:03.50]What Do You Know? [00:06.74]Have You Seen These Words? [00:10.53]above [00:13.17]Leaves grow above ground. Roots grow below ground. [00:20.32]as [00:22.96]As I walk down the street,I look at all the people. [00:29.13]cover [00:31
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