operating derrick

• 采油井架

operating derrick的用法和样例：

例句

1. At the end of this article, two examples of different types of derrick structures were analyzed.
   文中给出了两个采油井架的分析实例。
2. After removing the oil derrick, it will serve as a well-wheeled machine for workover operations.
   拆除采油井架后，又可作为轮式通井机使用，用于修井作业。