What we call this is a closed-cell foam structure.

我们称之为孔沫结构。

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.

孔金属沫中，小是分开的，可以漂浮水面，对建造更坚固更轻的船大有帮助，制造的太空船可以水上降落。