湿地对地下水，即地表以下的水量影响很大。
Wetlands have a big effect on groundwater, the amount of water below the surface of the land.
城市地下空间，是指城市规划区内地表以下的空间。
Urban underground space is the space under the city planning area.
该管的是洋溢着产品和密封地表以下的液体，以确保不存在空在包裹内。
The tube is filled with product and sealed below the surface of the liquid, ensuring there is no air space in the package.
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