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

我们称之为闭孔。

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.

在闭孔金属中，小气都是分开，漂浮在水面，对建造更坚固更轻船大有帮助，制造太空船在水上降落。