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The ocean bottom is made up of smooth plains.
洋底 由平坦的平原构成。
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Most of the ocean bottom is made up of smooth plains.
海底大部分是由平坦的平原构成。
"After mapping the surface, we see that approximately 40 percent is covered by smooth plains," she says.
“测绘后的表面，我们看到，大约有百分之四十是由光滑的平原，”她说。
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