金属一向以坚硬著称,但是,近些年来,人们研制成了一种像海绵一样的具有多孔结构的金属。这种金属的里里外外布满了无数个大小不一的孔洞,这些孔洞相互连通,人们称之为海绵金属。又因为它有点像泡沫塑料,所以又有泡沫金属之称。 Metals have always been known for their hardness, however, in recent years a sponge-like metal with a porous structure has been developed. There are countless holes of different sizes inside and outside the metal, which are interconnected and are called sponge metal. And because it is a bit like a foam, so there is foam metal.