When you build a dike or a wall or a dam, anything like that, when you bolster up a shoreline with riprap and sand and concrete, every year from that point onwards, your maintenance cost goes up and that structure weakens.
当你修筑坝、墙或水坝时,诸如此类,当你用抛石、沙子和混凝土加固海岸线时,从那时起每年,你维护成本都会增加,结构也会变弱。