块状物质 meaning in English

cake mass

Saturn ' s rings may look smooth and even when viewed through a telescope but they are in fact made up of clumps of particles and may be much denser than realized , scientists said on tuesday
土星环也许看起来很平滑，甚至从天文望远镜里看去也是一样；但土星环事实上是由许多粒子组成的块状物质所构成，而且比想像中的还要密集，科学家周二表示。
When the film is deposited at 450 , a kind of square substance exists on the surface of it . it is identified as na0 . 23 tio2 . experiments has proved that it has a negative effect on the photocatalysed efficiency , but it has no influence on the hydrophilicity
450反应温度时，薄膜表面会有方块状物质生成，经推断为na _ 2o ? xtio _ 2 ，实验证明它的存在对薄膜的光催化性能有害，但对亲水性没有影响。