n. 泛滥平原
n. a low plain adjacent to a river that is formed chiefly of river sediment and is subject to flooding
1.All downhill from here, down to the floodplain.
從這往山下走 一直下到平原
2.I found it buried in a floodplain a mile below the tomb three months ago.
三个月前 我发现它被埋在 墓穴一英里外的一个漫滩里