短語(yǔ)詞組短語(yǔ)permafrost aggradation 多年凍土進(jìn)化;凍土進(jìn)化aggradation rate 汙染率aggradation develops 淤積發(fā)展aggradation sediment 沉積river aggradation 河流淤積作用aggradation features 沉積特征aggradation plain 加積平原;填積平原;沉積平原aggradation island 淤積島;加積島aggradation coast 加積海岸 返回 aggradation