graded sediment 中文意思是什麼
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Back in the 1980s, however, the shing mun river was not for the fainthearted. it was severely polluted from industrial and commercial effluent, discharge from livestock farms, runoff from unsewered villages, and effluent entering through expedient connections in the new towns. its most polluted branches were the tai wai, fo tan and siu lek yuen nullahs, all of whose water quality was consistently graded bad, with black water and foul - smelling sediment
回想八十年代，城門河狀況堪虞，區內的工商業污水禽畜廢物無污水收集系統的鄉村污水和來自新市鎮的非法接駁污水渠將污水排入河內，造成嚴重污染，其中以大圍火炭和小瀝源明渠的污染情況最為嚴竣，持續錄得惡劣水質等級，河水淤黑而臭氣薰天。 -
Smith (1962) considered three alternate methods to determine an equivalent diameter of graded sediment.
史密斯（1962）提出了三種不同方法以計算不均勻沙的當量直徑。 -
Smith ( 1962 ) considered three alternate methods to determine an equivalent diameter of graded sediment
史密斯（ 1962 ）提出了三種不同方法以計算不均勻沙的當量直徑。 -
Non - graded sediment
不均粒沈積
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