工人们在海岸边建造了一道混凝土护岸来防止海浪侵蚀。

Workers built a concrete ___revetment along the shoreline to protect it from wave erosion.

河岸边的石砌护坡防止了土壤被水流侵蚀。

The stone ___revetment along the riverbank prevents soil erosion by the current.