refining practice

• 精炼

refining practice的用法和样例：

例句

1. The steel refining equipment alone may cost twenty million pound.
   单单钢的精炼设备就可能值两千万英镑。
2. Finally, we need to expand and enhance our refining capacity.
   最后，我们应该扩大并且提高我们精炼的容量。