For resolving the problem with admission of water and abstraction of waterlog of coastland, each marine estuarine has built the floodgate. 为解决沿海地区的引水和排涝问题,各入海河口都建了水闸。
Mudflats and estuarine silts are fine substrates rich in organic matter and low in oxygen. 淤泥滩和江河入海口处的淤泥是很细的基质，富含有机物质和低的含氧量。
