晶体的形成是一个缓慢的过程。

The ___formation of a crystal is a slow process.

由于太阳热，海水蒸发导致云的形成，通过凝结过程。

Due to solar heat, seawater evaporation leads to the ___formation of clouds through condensation.

新政策的制定需要广泛的研究。

The ___formation of a new policy requires extensive research.