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

与相应的固体相比，大多数液体的密度较低且压缩性，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，酷的是，这些是我们所知的最坚硬、密度最，几乎无法压缩的材料。

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

所有这些都只是针压缩流体流动的情况，其中压缩的东西（例如空气）使事情变得加棘手。

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，金属泡沫科技震动和压力吸收的帮助很大，内部气体让物质极度压缩，吸收很多机械能，而且依然保留金属的强度和耐用性。