refining fusion

例句：

1. 1.The process of refining oil involves heating it and separating the impurities.
   炼油过程包括加热并分离杂质。
2. 2. The engineer refined the design to make it more efficient.
   工程师对设计进行了优化，使其更高效。
3. 3. Refining is a crucial step in the production process.
   精炼是生产过程中至关重要的一步。