In operation it is lowered with open jaws, and by its own weight digs into the ground that is to be excavated. 佚名.神奇的知识之书.
Yuan Chwang gives an interesting account of a great Buddhist university at Nalanda, where ruins have quite recently been discovered and excavated. 赫伯特·乔治·威尔斯.世界史纲.
Excavated earth is removed in a similar manner. 伯莎M.克拉克.科学通论.
This ore could be excavated very cheaply by means of improved mining facilities, and transported at low cost to lake ports. 弗兰克·刘易斯·戴尔.爱迪生的生平和发明.
The pipe is lowered into contact with the bottom to be excavated and the material is pumped into hopper barges or into a hopper-well in the dredge itself. 佚名.神奇的知识之书.
This figure would also rest on the basis of using in the mixture the gravel excavated on the site. 弗兰克·刘易斯·戴尔.爱迪生的生平和发明.
The material excavated consisted largely of rock and formed one of the hugest engineering problems in the world’s history. 佚名.神奇的知识之书.