unobstructed crest of spillway

例句：

1. 1. The engineers carefully designed the unobstructed crest of the spillway to ensure efficient water discharge.
   工程师们仔细设计了溢洪道的无障碍顶部，以确保水流的高效排放。
2. 2. Theconstruction of this spillway was crucial formaintaining the river's natural flow andpreventing flooding.
   建造这个溢洪道对于保持河流的自然流动和防止洪水泛滥至关重要。
3. 3.The unobstructed crest ofthe spillway allowed for a smooth transitionfrom high water levels to low levels,ensuring stability during flood events.
   溢洪道无障碍的顶部使得从高水位到低水位的过渡过程平稳，确保在洪水事件中的稳定性。