open dredged caisson method detail敞口挖泥沉箱法
open caisson foundation[建] 沉井基础;沉井基础
open caisson technique沉井工艺
open caisson engineering沉井工程
continuous open caisson连续沉井
super large open caisson特大型沉井
rectangular open caisson矩形沉井
sinking open caisson沉井下沉
open caisson structure沉井构造