平时，闸门平铺在水底；在海水上涨时，闸门被注满空气，浮到水面阻隔海水。
When inactive, the gates will lay flat on the seafloor; when water levels rise, they will be pumped full of air and rise above the surface to block sea water.
当海水上涨，纽约城市的部分地区会被海水吞没，摩天大楼们就像一根根柱子树立在水中。
When sea levels rise, the ground in parts of NYC will be swallowed up, leaving skyscrapers as pillars in the water.
达尔文想：“这么说这些树原来长在海边，海水上涨淹没了它们，后来海底上升了……。”
“So those trees once stood by the sea,” thought Darwin. “The sea came up and covered them.
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