短語詞組短語lower r mantle 下地幔Lower Yangtze mantle 下?lián)P子地幔lower harness thread mantle 下地幔composition of lower mantle 下地慢組分lower mantle viscosity 下地幔粘性lower mantle mineral associations 下地幔礦物組合Downwelling superplume of lower mantle 超級下降地幔柱earth 's lower mantle 下地幔 返回 lower mantle