flood control free
免防洪
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Channels cut by loggers and oil companies eroded much of the island, and decades of flood control efforts have kept once free-flowing rivers from replenishing the wetlands' sediments.
伐木工和石油公司开凿的水道侵蚀了岛上的很多土地，几十年的防洪工程阻断了曾经通畅的河流，让湿地的沉积层得不到更新。
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