本文研究了珠江口滨海湿地沉积物中的重金属污染状况及其生物有效性。

This article studied the heavy metal pollution condition in the sediments of the coastal wetlands at the Pearl River estuary.

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当时，一场突如其来的大地震使得这片湿地下降了15到30英尺（约4.6米到9.1米），泥沙随之奔流而至，沉积物淹埋了一切，所有的树木和植物毁于其中。

That's when an earthquake suddenly lowered the swamp 15 to 30 feet and mud and sand rushed in, covering everything with sediment and killing trees and other plants.

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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。

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.

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