单词underdrainage
n.: 盲沟排水网络: 地下排水;暗渠排水
盲沟排水
Simply Talking about Design of Underdrainage at Freeway Section
浅谈高速公路挖方段暗排设计
Process Design of Underdrainage Treatment of Zhang Ji Coal Mine
张集矿井下排水处理工艺设计