controlled roof distance的用法和樣例：
例句
- By the same method we also obtain the distribution of the lunar zenith distance versus the occurring probability of earthquakes.
同樣的方法，可得地震的月球天頂距地震頻度分佈。 - This paper introduces the determination of the calculating formula of the empty-support distance of headwork in the tunnel with large sections by using the plate theory.
文章介紹了利用薄板理論確定大斷面巷道掘進期間的空頂距計算公式。
