The crown jewel of the project is this massive new floodwall.
该项目皇冠上的明珠是这座巨大的新防洪墙。
英语百科
Flood wall
(重定向自Floodwall)
A flood wall (or floodwall) is a primarily vertical artificial barrier designed to temporarily contain the waters of a river or other waterway which may rise to unusual levels during seasonal or extreme weather events. Flood walls are mainly used on locations where space is scarce, such as cities or where building levees or dikes (dykes) would interfere with other interests, such as existing buildings, historical architecture or commercial use of embankments.