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sand and gravel trap
ecol.
沉砂段
河流
el.
河流
沉沙段
;
沉沙池
eng.geol.
砂砾沉淀池〔槽〕
tech.
沉沙段
;
沉沙井
;
沉沙
砾
池
;
沉沙槽
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