When we step on saturated sand at the water's edge, it's fairly stable because the particles get pushed together and rest on each other, while any excess water escapes by flowing away to where the pressure is lower.
当我们踩在水边的饱和沙子上时，感觉相当稳，这是因为小石子互相挤压、推挤，从而结构紧凑，此时多余的水分会被挤压到压力较小的地方。