To make a path of brick, stone or concrete slabs, you should give the solid material a well-drained base.

用砖块、石头或混凝土板铺设小路，你应该让这类固体材料有一个排水良好的基底。

Group 18 solids meanwhile are the solid phase materials of the noble gases Group 18 on the periodic table.

18族固体同时是元素周期表中第18族惰性气体的固相材料。

Since it was cooler, too, they could hold on to those lighter gases, and their atmospheres grew tremendously, eventually outmassing the solid material in their cores.

由于它们更冷，就可以留住那些非常轻的气体，于是它们的大气也急剧膨胀，最终超过了它们核心固态物质的质量。

It's made by blowing bubbles through melted plastic and other additives to form a solid material with little bubble-like holes throughout it, giving it more structure at a microscopic level — like real wood.

它是通过将气泡吹过熔化的塑料和其他添加剂制成的，形成一种固体材料，上面有小气泡状的孔，在微观层面上赋予它更多的结构——就像真正的木头一样。