erosion

海岸侵蚀威胁着许多建在悬崖上的村庄。

Coastal ___erosion threatens many villages built on the cliffs.

海岸侵蚀正威胁着海岸沿线的许多房屋。

Coastal ___erosion is threatening many homes along the shoreline.

森林砍伐加速了土壤侵蚀并降低了土地肥力。

Deforestation speeds up soil ___erosion and reduces land fertility.