资料来源 : pyDict

[地]矽镁带

资料来源 : Webster's Revised Unabridged Dictionary (1913)

Sima \Si"ma\, n. (Arch.)
   A cyma.

资料来源 : WordNet®

sima
     n : rock that form the continuous lower layer of the earth's
         crust; rich in silicon and magnesium