detain flood的用法和樣例：
例句
- Houses built within flood storage and detention areas shall have flat roofs.
在蓄滯洪區內建造房屋應當采用平頂式結構。 - A flood storage and detention area means a depression or a lake from outside embankments including flood--diversion mouths for temporarily storing floodwater.
蓄滯洪區是指包括分洪口在內的河堤背水面以外臨時(shí)貯存洪水的低洼地區及湖泊等。
