你好,物质 substance 是不可数名词。 That which has mass and occupies space; matter. 物体:有质量及占据空间的东西;物质 A material of a particular kind or constitution. 物质:特定种类或具有特定成分的材料 Essential nature; essence. 实质;本质 Gist; heart. 本旨;主旨 That which is solid and practical in character, quality, or importance: 内容:坚实的质地、特征或重要性: a plan without substance. 空洞的计划 Density; body: 密度;形体: Air has little substance. 空气的密度很小 Material possessions; goods; wealth: 财产;物品;财富: a person of substance. 富有的人意思为物质,物品时可数;意思为事实基础,根据,主旨要点,实质,或重要性时不可数