短語詞組短語enhancement of primary sedimentation 強化一級處理enhanced primary sedimentation 強化一級處理primary sedimentation pond 初次沉淀池primary sedimentation pool 初沉池circular primary sedimentation tank 輻流式初沉池primary sedimentation tank 初次沉淀池;初沉池primary sedimentation basin 一次沉淀池sludge from primary sedimentation tank 初沉污泥 返回 primary sedimentation