premelting transition

例句：

1. 1. The premelting transition is a critical stage in the process of alloy formation.
   预熔化过渡是合金形成过程中的一个关键阶段。
2. 2. During the premelting transition, the temperature and pressure are rapidly changing.
   在预熔化过渡期间，温度和压力正在迅速变化。
3. 3. The understanding of the premelting transition is crucial for the optimization of the alloycomposition.
   理解预熔化过渡对于优化合金成分至关重要。