noun 下载 🔗分享 底层，下层。 A layer that lies underneath another. Examples : "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。 material geology structure 与AI对话词汇游戏阅读练习
noun 下载 🔗分享 基础, 根基。 The underlying cause or basis of something. Examples : "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。 theory philosophy science 与AI对话词汇游戏阅读练习
noun 下载 🔗分享 底层，基底. A substrate. Examples : "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。 material substance 与AI对话词汇游戏阅读练习
