River deltas are difficult places for map makers.
河流三角洲的绘制对于地图编制者是很困难的。
Sand bodies of braided-river deltas in this region are good reservoirs of oil and gas.
辫状河三角洲砂体是重要的油气储集场所。
Yellow River delta is one of the three deltas in our country.
黄河三角洲是我国的三大河口三角洲之一。
Yellow River delta is one of the three deltas in our country.
黄河三角洲是我国的三大河口三角洲之一。
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