You have learned in a former book that sulphur is a yellow, solid substance which takes fire very easily.

通过以前的学习, 你应该知道, 硫磺是一种非常容易燃烧的黄色固体物质。

The material is a kind of foam: a solid substance that is filled with air and is soft.

一种满是气孔的固体物质，手感柔软。

Within samples collected from the solid substance lying beneath the ice, they found fossils of microscope marine plants

在从冰下的固体物质收集的样本中，他们发现了显微镜海洋植物的化石。

The turnpike lamp was a blur, quite out of the lamp's usual place apparently, and its rays looked solid substance on the fog.

收费公路灯是模糊的，显然完全偏离了灯通常的位置，它的光线在雾中看起来是固体物质。

Within samples collected from the solid substance lying beneath the ice, they found fossils of microscopic marine plants which suggest that the region was once an open ocean, not solid ice.

在收集了冰下固体物质样本并经显微镜观察之后，他们发现海洋植物的化石表明该地区曾经是一片开阔的海域，没有固体冰的存在。