Most liquids are less dense and more compressible than their corresponding solids, but only slightly so.

与相应固体相比，大多数液体密度较低且可压性更高，但仅略微如此。

Aggregated diamond nanorods, or hyperdiamonds, if you wanna sound cool, these are the hardest, most dense, and least compressible material we know of.

聚合金刚石纳，超级金刚石，更酷是，这些是我们所知最坚硬、密度最高，几乎无法压料。

And all of that is just for the case of incompressible fluid flow, where something compressible, like air, makes things trickier still.

所有这些都只是针对不可压流体流动情况，其中可压东西（例如空气）使事情变得更加棘手。

In general, metal foams are useful for high-tech shock and impact absorbers, the gas inside makes them extremely compressible, so they can absorb a lot of mechanical energy, while still retaining some of the strength and durability of a metal.

总之，金属泡沫对高科技震动和压力吸收帮助很大，内部气体让物质极度压，可吸收很多机械能，而且依然保留金属强度和耐用性。