But in closed-pored metal foams, the little bubbles are all separated, which means they can float in water, which could be helpful for building sturdier, lighter boats and spacecraft that can make water landings.

在闭孔金属泡沫中，小气泡都是分开的，可以漂浮在水面，对建造更坚固更轻的船大有帮助，制造的太空船可以在水上降落。

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