在海滩上，我们发现了一块由矿物沉积形成的坚硬团块。

On the beach, we found a hard ___concretion formed by mineral deposits.

随着时间的推移，沙子在水下逐渐凝结成坚硬的岩石。

Over time, the sand underwent ___concretion into hard rock underwater.

这个哲学体系是他多年思考的具体化。

This philosophical system is the ___crystallization of his years of reflection.