词汇	Estas dube
释义	Estas dube 他是否知道那件事还有疑问。
随便看	foundation style foundation style selection foundation subject for material science foundation subject for material technique foundation support foundation supporting foundation supporting course foundation surface Foundation survey achievement foundation system foundation teaching foundation technology foundation template foundation test foundation texture foundation that is produeed foundation thaw collapse foundation thawing and sinking foundation tie rod foundation tie rost foundation to gain a foothold Foundation training foundation treatement foundation treating Foundation treatise