CMB studies show that the universe is flat.

CMB相关研究证实，宇宙是平的。

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(See Resources to get more information about CMB).

有关CMB的更多信息，请参见参考资料。

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Therefore, the CMB is the beginning and the end of whole mantle convection.

因此，地幔底层既是全地幔对流的起点，又是全地幔对流的终点。

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Therefore, the CMB is the beginning and the end of whole mantle convection.

因此，地幔底层既是全地幔对流的起点，又是全地幔对流的终点。

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