The construction of vertical cut-off walls on culvert pipes is the most difficult part in the reinforcement of reservoirs in danger.
病险水库除险加固中，垂直防渗墙在涵管上的施工是难点。
The construction of vertical cut-off walls on culvert pipes is the most difficult part in the reinforcement of reservoirs in danger.
病险水库除险加固中，垂直防渗墙在涵管上的施工是难点。
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