detain flood的用法和样例：
例句
- Houses built within flood storage and detention areas shall have flat roofs.
在蓄滞洪区内建造房屋应当采用平顶式结构。 - A flood storage and detention area means a depression or a lake from outside embankments including flood--diversion mouths for temporarily storing floodwater.
蓄滞洪区是指包括分洪口在内的河堤背水面以外临时贮存洪水的低洼地区及湖泊等。
