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，几乎无法缩的材料。

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

相应的固体相比，大多数液体的密度较低且可缩性更高，但仅略微如此。

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吸收的帮助很大，内部气体让物质极度缩，可吸收很多机械能，而且依然保留金属的强度耐用性。