底拖 meaning in English
bottom pull
Examples
- As the sampler is dragged along the bed, it collects a sample from the top layer of bed material .
取样器沿河底拖动，收取表层河床质。 - We succeeded in crossing hanjing river of zhong - wu gas pipeline project , dawen river of jining branch line of west - east gas pipeline using the technique of trenching in water , controlling negative buoyancy and bottom towing without water interception
公司采用带水大开挖成沟，控制负浮力，管道底拖法等施工工艺，在江河不断流的前提下，成功完成了忠武输气管道襄樊支线汉江穿越、西气东输冀宁支线大汶河穿越等工程。