solidifying characteristic of oil

例句：

1. 1. The oil is solidifying as it cools.
   油在冷却时正在凝固。
2. 2. The process of solidifying the oil is crucial for the production.
   石油凝固过程对于生产至关重要。
3. 3. The solidifying process can be slowed down by adding water.
   通过添加水可以减缓凝固过程。