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

与相应的固相比，大多数液的密度较低且性更高，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.

聚合金刚石纳米棒，或超级金刚石，更酷的是，这些是我们所知的最坚硬、密度最高，几乎无法的材料。

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动的情况，其中的东西（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力吸收的帮助很大，内部气让物质极度，吸收很多机械能，而且依然保留金属的强度和耐用性。