The depth of the river is maintained by dredging.
通过疏浚保持河道的深度。
When a clamshell dredger is used to carry out over-depth and over-width dredging, accuracy control is always one of the difficulties.
抓斗式挖泥船进行超深超宽施工时，精度控制始终是难题之一。
When a clamshell dredger is used to carry out over-depth and over-width dredging, accuracy control is always one of the difficulties.
抓斗式挖泥船进行超深超宽施工时，精度控制始终是难题之一。
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