breakwater

名词 breakwater:

1. a protective structure of stone or concrete; extends from shore into the water to prevent a beach from washing away
   同义词：groin, groyne, mole, bulwark, seawall, jetty

break.wa.ter

n.（名词）
A barrier that protects a harbor or shore from the full impact of waves.
防波堤，防浪墙：保护一个港口或海岸以防波浪冲击的障碍物