| 单词 | sima | 
| 释义 | sima [`sī·mǝ]  PETROLOGY A petrologic term for the lower layer of the earth's crust, composed of silica- and magnesia-rich rocks; source of basaltic magma; sima is equivalent to the lower part of the continental crust and the bulk of the oceanic crust. Also known as intermediate layer.  | 
	
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