最后，着重讨论了上地幔与全地幔对流的论争。
The issue of upper vs whole mantle convection is critically discussed.
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。
Therefore, the CMB is the beginning and the end of whole mantle convection.
无论是简单的全地幔对流模型或分层地幔对流模型，都不能完全解释全部观测事实。
Simple models, no matter whole mantle convection model, or layered mantle convection model, cannot explain all the observations.
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