路易斯安那州官员希望开始建造作为屏障的沙堤来阻止石油侵入脆弱的沼泽生态系统；
Louisiana officials want to start building sand berms as barrier islands, to block oil from entering the fragile marsh ecosystems;
路易斯安那州官员希望开始建造作为屏障的沙堤来阻止石油侵入脆弱的沼泽生态系统；
Louisiana officials want to start building sand berms as barrier islands, to block oil from entering the fragile marsh ecosystems;
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