| 单词 | pre-Imbrian | 
| 释义 | pre-Imbrian [prē`im·brē·ǝn]  ASTRONOMY Pertaining to the oldest lunar topographic features and lithologic map units constituting a system of rocks that appear in the mountainous terrae and are well displayed in the southern part of the visible lunar surface and over much of the reverse side.  | 
	
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