| 词汇 | alluvium period | 
	
		| 释义 | alluvium period 基本例句
 第四纪
 Woolly mammoths died out during the late Quaternary period.猛犸象在第四纪晚期灭绝了。
 This type of soil from the quartzy period is called the Villafranchienne terraces.这种典型的第四纪地层土壤被叫做维拉弗朗阶土质。
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