noun🔗Share底层，下层。 A layer that lies underneath another."The archeologists carefully brushed away the topsoil to reveal the ancient Roman mosaic's substratum of packed sand. "考古学家们小心翼翼地刷去表层土壤，为了露出古罗马马赛克镶嵌画下面那层夯实的沙子底层。materialgeologystructureChat with AIVocabulary GamePractice Reading
noun🔗Share基础, 根基。 The underlying cause or basis of something."The substratum of her anxiety was the pressure to succeed in school. "她焦虑的根源在于她在学校里必须成功的压力。theoryphilosophyscienceChat with AIVocabulary GamePractice Reading
noun🔗Share底层，基底. A substrate."The artist painted a layer of gesso on the canvas to create a smooth substratum for the oil paints. "艺术家在画布上涂了一层石膏，为油画颜料创造了一个平滑的底层。materialsubstanceChat with AIVocabulary GamePractice Reading
